diff --git a/apps/openmw/mwgui/mapwindow.cpp b/apps/openmw/mwgui/mapwindow.cpp
index 44306c30a5..d158755736 100644
--- a/apps/openmw/mwgui/mapwindow.cpp
+++ b/apps/openmw/mwgui/mapwindow.cpp
@@ -583,8 +583,8 @@ namespace MWGui
             if (!entry.mMapTexture)
             {
                 if (!mInterior)
-                    requestMapRender(
-                        &MWBase::Environment::get().getWorldModel()->getExterior(entry.mCellX, entry.mCellY));
+                    requestMapRender(&MWBase::Environment::get().getWorldModel()->getExterior(
+                        entry.mCellX, entry.mCellY, ESM::Cell::sDefaultWorldspaceId));
 
                 osg::ref_ptr<osg::Texture2D> texture = mLocalMapRender->getMapTexture(entry.mCellX, entry.mCellY);
                 if (texture)
@@ -641,7 +641,8 @@ namespace MWGui
             for (MapEntry& entry : mMaps)
             {
                 if (!entry.mMapTexture && !widgetCropped(entry.mMapWidget, mLocalMap))
-                    world->getDoorMarkers(worldModel->getExterior(entry.mCellX, entry.mCellY), doors);
+                    world->getDoorMarkers(
+                        worldModel->getExterior(entry.mCellX, entry.mCellY, ESM::Cell::sDefaultWorldspaceId), doors);
             }
             if (doors.empty())
                 return;
diff --git a/apps/openmw/mwgui/travelwindow.cpp b/apps/openmw/mwgui/travelwindow.cpp
index 55ff9fa601..c01b9361b1 100644
--- a/apps/openmw/mwgui/travelwindow.cpp
+++ b/apps/openmw/mwgui/travelwindow.cpp
@@ -130,8 +130,8 @@ namespace MWGui
                 = MWWorld::positionToCellIndex(transport[i].mPos.pos[0], transport[i].mPos.pos[1]);
             if (cellname.empty())
             {
-                MWWorld::CellStore& cell
-                    = MWBase::Environment::get().getWorldModel()->getExterior(cellIndex.x(), cellIndex.y());
+                MWWorld::CellStore& cell = MWBase::Environment::get().getWorldModel()->getExterior(
+                    cellIndex.x(), cellIndex.y(), ESM::Cell::sDefaultWorldspaceId);
                 cellname = MWBase::Environment::get().getWorld()->getCellName(&cell);
                 interior = false;
             }
diff --git a/apps/openmw/mwlua/luabindings.cpp b/apps/openmw/mwlua/luabindings.cpp
index e05466740c..3e40503fbe 100644
--- a/apps/openmw/mwlua/luabindings.cpp
+++ b/apps/openmw/mwlua/luabindings.cpp
@@ -113,8 +113,10 @@ namespace MWLua
         addTimeBindings(api, context, true);
         api["getCellByName"]
             = [](std::string_view name) { return GCell{ &MWBase::Environment::get().getWorldModel()->getCell(name) }; };
-        api["getExteriorCell"]
-            = [](int x, int y) { return GCell{ &MWBase::Environment::get().getWorldModel()->getExterior(x, y) }; };
+        api["getExteriorCell"] = [](int x, int y) {
+            return GCell{ &MWBase::Environment::get().getWorldModel()->getExterior(
+                x, y, ESM::Cell::sDefaultWorldspaceId) };
+        };
         api["activeActors"] = GObjectList{ worldView->getActorsInScene() };
         api["createObject"] = [](std::string_view recordId, sol::optional<int> count) -> GObject {
             // Doesn't matter which cell to use because the new object will be in disabled state.
diff --git a/apps/openmw/mwscript/transformationextensions.cpp b/apps/openmw/mwscript/transformationextensions.cpp
index 110309ae1a..4f7a136764 100644
--- a/apps/openmw/mwscript/transformationextensions.cpp
+++ b/apps/openmw/mwscript/transformationextensions.cpp
@@ -402,7 +402,8 @@ namespace MWScript
                     if (store->isExterior())
                     {
                         const osg::Vec2i cellIndex = MWWorld::positionToCellIndex(x, y);
-                        store = &worldModel->getExterior(cellIndex.x(), cellIndex.y());
+                        store
+                            = &worldModel->getExterior(cellIndex.x(), cellIndex.y(), store->getCell()->getWorldSpace());
                     }
                 }
                 catch (std::exception&)
@@ -417,7 +418,7 @@ namespace MWScript
                     if (!isPlayer)
                         return;
                     const osg::Vec2i cellIndex = MWWorld::positionToCellIndex(x, y);
-                    store = &worldModel->getExterior(cellIndex.x(), cellIndex.y());
+                    store = &worldModel->getExterior(cellIndex.x(), cellIndex.y(), store->getCell()->getWorldSpace());
                 }
                 if (store)
                 {
@@ -473,8 +474,8 @@ namespace MWScript
                 MWWorld::Ptr base = ptr;
                 if (isPlayer)
                 {
-                    MWWorld::CellStore* cell
-                        = &MWBase::Environment::get().getWorldModel()->getExterior(cellIndex.x(), cellIndex.y());
+                    MWWorld::CellStore* cell = &MWBase::Environment::get().getWorldModel()->getExterior(
+                        cellIndex.x(), cellIndex.y(), ESM::Cell::sDefaultWorldspaceId);
                     ptr = world->moveObject(ptr, cell, osg::Vec3(x, y, z));
                 }
                 else
@@ -568,7 +569,8 @@ namespace MWScript
                 if (player.getCell()->isExterior())
                 {
                     const osg::Vec2i cellIndex = MWWorld::positionToCellIndex(x, y);
-                    store = &MWBase::Environment::get().getWorldModel()->getExterior(cellIndex.x(), cellIndex.y());
+                    store = &MWBase::Environment::get().getWorldModel()->getExterior(
+                        cellIndex.x(), cellIndex.y(), player.getCell()->getCell()->getWorldSpace());
                 }
                 else
                     store = player.getCell();
diff --git a/apps/openmw/mwstate/statemanagerimp.cpp b/apps/openmw/mwstate/statemanagerimp.cpp
index 38bba75c05..836f4a765a 100644
--- a/apps/openmw/mwstate/statemanagerimp.cpp
+++ b/apps/openmw/mwstate/statemanagerimp.cpp
@@ -563,7 +563,8 @@ void MWState::StateManager::loadGame(const Character* character, const std::file
         {
             // Cell no longer exists (i.e. changed game files), choose a default cell
             Log(Debug::Warning) << "Warning: Player character's cell no longer exists, changing to the default cell";
-            MWWorld::CellStore& cell = MWBase::Environment::get().getWorldModel()->getExterior(0, 0);
+            MWWorld::CellStore& cell
+                = MWBase::Environment::get().getWorldModel()->getExterior(0, 0, ESM::Cell::sDefaultWorldspaceId);
             float x, y;
             MWBase::Environment::get().getWorld()->indexToPosition(0, 0, x, y, false);
             ESM::Position pos;
diff --git a/apps/openmw/mwworld/esmstore.cpp b/apps/openmw/mwworld/esmstore.cpp
index ad1a3ff428..d569b155cb 100644
--- a/apps/openmw/mwworld/esmstore.cpp
+++ b/apps/openmw/mwworld/esmstore.cpp
@@ -14,6 +14,7 @@
 #include <components/misc/algorithm.hpp>
 
 #include <components/esm4/common.hpp>
+#include <components/esm4/loadwrld.hpp>
 #include <components/esm4/reader.hpp>
 #include <components/esm4/readerutils.hpp>
 #include <components/esmloader/load.hpp>
diff --git a/apps/openmw/mwworld/esmstore.hpp b/apps/openmw/mwworld/esmstore.hpp
index 004c456ff1..792ba6f46a 100644
--- a/apps/openmw/mwworld/esmstore.hpp
+++ b/apps/openmw/mwworld/esmstore.hpp
@@ -42,6 +42,7 @@ namespace ESM4
     struct Ingredient;
     struct MiscItem;
     struct Weapon;
+    struct World;
 }
 
 namespace ESM
@@ -120,7 +121,7 @@ namespace MWWorld
             Store<ESM4::Static>, Store<ESM4::Cell>, Store<ESM4::Light>, Store<ESM4::Reference>, Store<ESM4::Activator>,
             Store<ESM4::Potion>, Store<ESM4::Ammunition>, Store<ESM4::Armor>, Store<ESM4::Book>, Store<ESM4::Clothing>,
             Store<ESM4::Container>, Store<ESM4::Door>, Store<ESM4::Ingredient>, Store<ESM4::MiscItem>,
-            Store<ESM4::Weapon>>;
+            Store<ESM4::Weapon>, Store<ESM4::World>>;
 
     private:
         template <typename T>
diff --git a/apps/openmw/mwworld/scene.cpp b/apps/openmw/mwworld/scene.cpp
index 65dd36c691..c82c3f95b1 100644
--- a/apps/openmw/mwworld/scene.cpp
+++ b/apps/openmw/mwworld/scene.cpp
@@ -551,12 +551,13 @@ namespace MWWorld
             else
                 unloadCell(cell, navigatorUpdateGuard.get());
         }
-
-        mNavigator.setWorldspace(Misc::StringUtils::lowerCase(mWorld.getWorldModel()
-                                                                  .getExterior(playerCellX, playerCellY)
-                                                                  .getCell()
-                                                                  ->getWorldSpace()
-                                                                  .serializeText()),
+        ESM::RefId currentWorldSpace = mCurrentCell->getCell()->getWorldSpace();
+        mNavigator.setWorldspace(
+            Misc::StringUtils::lowerCase(mWorld.getWorldModel()
+                                             .getExterior(playerCellX, playerCellY, currentWorldSpace)
+                                             .getCell()
+                                             ->getWorldSpace()
+                                             .serializeText()),
             navigatorUpdateGuard.get());
         mNavigator.updateBounds(pos, navigatorUpdateGuard.get());
 
@@ -580,7 +581,7 @@ namespace MWWorld
                 {
                     if (!isCellInCollection(x, y, collection))
                     {
-                        refsToLoad += mWorld.getWorldModel().getExterior(x, y).count();
+                        refsToLoad += mWorld.getWorldModel().getExterior(x, y, currentWorldSpace).count();
                         cellsPositionsToLoad.emplace_back(x, y);
                     }
                 }
@@ -614,7 +615,7 @@ namespace MWWorld
         {
             if (!isCellInCollection(x, y, mActiveCells))
             {
-                CellStore& cell = mWorld.getWorldModel().getExterior(x, y);
+                CellStore& cell = mWorld.getWorldModel().getExterior(x, y, currentWorldSpace);
                 loadCell(cell, loadingListener, changeEvent, pos, navigatorUpdateGuard.get());
             }
         }
@@ -623,7 +624,7 @@ namespace MWWorld
 
         navigatorUpdateGuard.reset();
 
-        CellStore& current = mWorld.getWorldModel().getExterior(playerCellX, playerCellY);
+        CellStore& current = mWorld.getWorldModel().getExterior(playerCellX, playerCellY, currentWorldSpace);
         MWBase::Environment::get().getWindowManager()->changeCell(&current);
 
         if (changeEvent)
@@ -676,7 +677,8 @@ namespace MWWorld
             loadingListener->setLabel("#{OMWEngine:TestingExteriorCells} (" + std::to_string(i) + "/"
                 + std::to_string(cells.getExtSize()) + ")...");
 
-            CellStore& cell = mWorld.getWorldModel().getExterior(it->mData.mX, it->mData.mY);
+            CellStore& cell
+                = mWorld.getWorldModel().getExterior(it->mData.mX, it->mData.mY, ESM::Cell::sDefaultWorldspaceId);
             mNavigator.setWorldspace(Misc::StringUtils::lowerCase(cell.getCell()->getWorldSpace().serializeText()),
                 navigatorUpdateGuard.get());
             const osg::Vec3f position
@@ -1177,7 +1179,8 @@ namespace MWWorld
                     + mPreloadDistance;
 
                 if (dist < loadDist)
-                    preloadCell(mWorld.getWorldModel().getExterior(cellX + dx, cellY + dy));
+                    preloadCell(
+                        mWorld.getWorldModel().getExterior(cellX + dx, cellY + dy, ESM::Cell::sDefaultWorldspaceId));
             }
         }
     }
@@ -1194,7 +1197,8 @@ namespace MWWorld
                 for (int dy = -mHalfGridSize; dy <= mHalfGridSize; ++dy)
                 {
                     mPreloader->preload(
-                        mWorld.getWorldModel().getExterior(x + dx, y + dy), mRendering.getReferenceTime());
+                        mWorld.getWorldModel().getExterior(x + dx, y + dy, cell.getCell()->getWorldSpace()),
+                        mRendering.getReferenceTime());
                     if (++numpreloaded >= mPreloader->getMaxCacheSize())
                         break;
                 }
@@ -1277,7 +1281,9 @@ namespace MWWorld
             {
                 osg::Vec3f pos = dest.mPos.asVec3();
                 const osg::Vec2i cellIndex = positionToCellIndex(pos.x(), pos.y());
-                preloadCell(mWorld.getWorldModel().getExterior(cellIndex.x(), cellIndex.y()), true);
+                preloadCell(
+                    mWorld.getWorldModel().getExterior(cellIndex.x(), cellIndex.y(), ESM::Cell::sDefaultWorldspaceId),
+                    true);
                 exteriorPositions.emplace_back(pos, gridCenterToBounds(getNewGridCenter(pos)));
             }
         }
diff --git a/apps/openmw/mwworld/store.cpp b/apps/openmw/mwworld/store.cpp
index 9936b1e999..95cf1bca22 100644
--- a/apps/openmw/mwworld/store.cpp
+++ b/apps/openmw/mwworld/store.cpp
@@ -8,6 +8,7 @@
 #include <components/esm/records.hpp>
 #include <components/esm3/esmreader.hpp>
 #include <components/esm3/esmwriter.hpp>
+#include <components/esm4/loadwrld.hpp>
 #include <components/loadinglistener/loadinglistener.hpp>
 #include <components/misc/rng.hpp>
 
@@ -1104,10 +1105,32 @@ namespace MWWorld
         return foundCell->second;
     }
 
+    const ESM4::Cell* Store<ESM4::Cell>::searchExterior(int x, int y, ESM::RefId worldSpace) const
+    {
+        const auto foundWorldSpace = mExteriors.find(worldSpace);
+        if (foundWorldSpace == mExteriors.end())
+        {
+            return nullptr;
+        }
+        const auto foundCell = foundWorldSpace->second.find(std::make_pair(x, y));
+        if (foundCell == foundWorldSpace->second.end())
+            return nullptr;
+        return foundCell->second;
+    }
+
+    bool Store<ESM4::Cell>::exteriorExists(ESM::RefId worldspace) const
+    {
+        const auto foundWorldSpace = mExteriors.find(worldspace);
+        return (foundWorldSpace != mExteriors.end());
+    }
+
     ESM4::Cell* Store<ESM4::Cell>::insert(const ESM4::Cell& item, bool overrideOnly)
     {
         auto cellPtr = TypedDynamicStore<ESM4::Cell>::insert(item, overrideOnly);
         mCellNameIndex[cellPtr->mEditorId] = cellPtr;
+        if (cellPtr->isExterior())
+            mExteriors[cellPtr->mParent][std::make_pair(cellPtr->getGridX(), cellPtr->getGridY())] = cellPtr;
+
         return cellPtr;
     }
 
@@ -1115,6 +1138,9 @@ namespace MWWorld
     {
         auto cellPtr = TypedDynamicStore<ESM4::Cell>::insertStatic(item);
         mCellNameIndex[cellPtr->mEditorId] = cellPtr;
+        if (cellPtr->isExterior())
+            mExteriors[cellPtr->mParent][std::make_pair(cellPtr->getGridX(), cellPtr->getGridY())] = cellPtr;
+
         return cellPtr;
     }
 }
@@ -1177,3 +1203,4 @@ template class MWWorld::TypedDynamicStore<ESM4::Light>;
 template class MWWorld::TypedDynamicStore<ESM4::Reference, ESM::FormId>;
 template class MWWorld::TypedDynamicStore<ESM4::Cell>;
 template class MWWorld::TypedDynamicStore<ESM4::Weapon>;
+template class MWWorld::TypedDynamicStore<ESM4::World>;
diff --git a/apps/openmw/mwworld/store.hpp b/apps/openmw/mwworld/store.hpp
index 79bd4df536..95591d67b8 100644
--- a/apps/openmw/mwworld/store.hpp
+++ b/apps/openmw/mwworld/store.hpp
@@ -282,9 +282,12 @@ namespace MWWorld
     {
         std::unordered_map<std::string, ESM4::Cell*, Misc::StringUtils::CiHash, Misc::StringUtils::CiEqual>
             mCellNameIndex;
+        std::unordered_map<ESM::RefId, std::map<std::pair<int, int>, ESM4::Cell*>> mExteriors;
 
     public:
         const ESM4::Cell* searchCellName(std::string_view) const;
+        const ESM4::Cell* searchExterior(int x, int y, ESM::RefId worldSpace) const;
+        bool exteriorExists(ESM::RefId worldspace) const;
         ESM4::Cell* insert(const ESM4::Cell& item, bool overrideOnly = false);
         ESM4::Cell* insertStatic(const ESM4::Cell& item);
     };
diff --git a/apps/openmw/mwworld/worldimp.cpp b/apps/openmw/mwworld/worldimp.cpp
index 8c13a9a4c0..b5ab3f2b4b 100644
--- a/apps/openmw/mwworld/worldimp.cpp
+++ b/apps/openmw/mwworld/worldimp.cpp
@@ -1266,7 +1266,9 @@ namespace MWWorld
         const osg::Vec2i index = positionToCellIndex(position.x(), position.y());
 
         CellStore* cell = ptr.getCell();
-        CellStore& newCell = mWorldModel.getExterior(index.x(), index.y());
+        ESM::RefId worldspaceId
+            = cell->isExterior() ? cell->getCell()->getWorldSpace() : ESM::Cell::sDefaultWorldspaceId;
+        CellStore& newCell = mWorldModel.getExterior(index.x(), index.y(), worldspaceId);
         bool isCellActive
             = getPlayerPtr().isInCell() && getPlayerPtr().getCell()->isExterior() && mWorldScene->isCellActive(newCell);
 
@@ -2069,7 +2071,7 @@ namespace MWWorld
         if (cell->isExterior())
         {
             const osg::Vec2i index = positionToCellIndex(pos.pos[0], pos.pos[1]);
-            cell = &mWorldModel.getExterior(index.x(), index.y());
+            cell = &mWorldModel.getExterior(index.x(), index.y(), cell->getCell()->getWorldSpace());
         }
 
         MWWorld::Ptr dropped = object.getClass().copyToCell(object, *cell, pos, count);
@@ -2753,7 +2755,7 @@ namespace MWWorld
                 if (xResult.ec == std::errc::result_out_of_range || yResult.ec == std::errc::result_out_of_range)
                     throw std::runtime_error("Cell coordinates out of range.");
                 else if (xResult.ec == std::errc{} && yResult.ec == std::errc{})
-                    ext = mWorldModel.getExterior(x, y).getCell();
+                    ext = mWorldModel.getExterior(x, y, ESM::Cell::sDefaultWorldspaceId).getCell();
                 // ignore std::errc::invalid_argument, as this means that name probably refers to a interior cell
                 // instead of comma separated coordinates
             }
diff --git a/apps/openmw/mwworld/worldmodel.cpp b/apps/openmw/mwworld/worldmodel.cpp
index 58f47eb8aa..ecc3a97cd3 100644
--- a/apps/openmw/mwworld/worldmodel.cpp
+++ b/apps/openmw/mwworld/worldmodel.cpp
@@ -76,11 +76,12 @@ MWWorld::CellStore& MWWorld::WorldModel::getCellStore(const ESM::Cell* cell)
     }
     else
     {
+        auto& Esm3Exteriors = mExteriors[ESM::Cell::sDefaultWorldspaceId];
         std::map<std::pair<int, int>, CellStore*>::iterator result
-            = mExteriors.find(std::make_pair(cell->getGridX(), cell->getGridY()));
+            = Esm3Exteriors.find(std::make_pair(cell->getGridX(), cell->getGridY()));
 
-        if (result == mExteriors.end())
-            result = mExteriors.emplace(std::make_pair(cell->getGridX(), cell->getGridY()), cellStore).first;
+        if (result == Esm3Exteriors.end())
+            result = Esm3Exteriors.emplace(std::make_pair(cell->getGridX(), cell->getGridY()), cellStore).first;
 
         return *result->second;
     }
@@ -160,31 +161,69 @@ MWWorld::WorldModel::WorldModel(const MWWorld::ESMStore& store, ESM::ReadersCach
 {
 }
 
-MWWorld::CellStore& MWWorld::WorldModel::getExterior(int x, int y)
+MWWorld::CellStore& MWWorld::WorldModel::getExterior(int x, int y, ESM::RefId exteriorWorldspace)
 {
-    std::map<std::pair<int, int>, CellStore*>::iterator result = mExteriors.find(std::make_pair(x, y));
-
-    if (result == mExteriors.end())
+    auto foundWorldspace = mExteriors.find(exteriorWorldspace);
+    std::map<std::pair<int, int>, CellStore*>::iterator result;
+    if (exteriorWorldspace == ESM::Cell::sDefaultWorldspaceId)
     {
-        const ESM::Cell* cell = mStore.get<ESM::Cell>().search(x, y);
+        auto& esm3Exteriors = mExteriors[exteriorWorldspace];
+        result = esm3Exteriors.find(std::make_pair(x, y));
 
-        if (!cell)
+        if (result == esm3Exteriors.end())
         {
-            // Cell isn't predefined. Make one on the fly.
-            ESM::Cell record;
-            record.mData.mFlags = ESM::Cell::HasWater;
-            record.mData.mX = x;
-            record.mData.mY = y;
-            record.mWater = 0;
-            record.mMapColor = 0;
-            record.updateId();
+            const ESM::Cell* cell = mStore.get<ESM::Cell>().search(x, y);
 
-            cell = MWBase::Environment::get().getESMStore()->insert(record);
+            if (!cell)
+            {
+                // Cell isn't predefined. Make one on the fly.
+                ESM::Cell record;
+                record.mData.mFlags = ESM::Cell::HasWater;
+                record.mData.mX = x;
+                record.mData.mY = y;
+                record.mWater = 0;
+                record.mMapColor = 0;
+                record.updateId();
+
+                cell = MWBase::Environment::get().getESMStore()->insert(record);
+            }
+
+            CellStore* cellStore
+                = &mCells.emplace(cell->mId, CellStore(MWWorld::Cell(*cell), mStore, mReaders)).first->second;
+            result = esm3Exteriors.emplace(std::make_pair(x, y), cellStore).first;
         }
+    }
+    else
+    {
+        const Store<ESM4::Cell>& cell4Store = mStore.get<ESM4::Cell>();
+        if (cell4Store.exteriorExists(exteriorWorldspace))
+        {
+            auto& exteriors = mExteriors[exteriorWorldspace];
 
-        CellStore* cellStore
-            = &mCells.emplace(cell->mId, CellStore(MWWorld::Cell(*cell), mStore, mReaders)).first->second;
-        result = mExteriors.emplace(std::make_pair(x, y), cellStore).first;
+            result = exteriors.find(std::make_pair(x, y));
+
+            if (result == exteriors.end())
+            {
+                const ESM4::Cell* cell = cell4Store.searchExterior(x, y, exteriorWorldspace);
+                if (!cell)
+                {
+                    ESM4::Cell record;
+                    record.mId = MWBase::Environment::get().getESMStore()->generateId();
+                    record.mParent = exteriorWorldspace;
+                    record.mX = x;
+                    record.mY = y;
+                    record.mCellFlags = !ESM4::CELL_Interior;
+                    cell = MWBase::Environment::get().getESMStore()->insert(record);
+                }
+                CellStore* cellStore
+                    = &mCells.emplace(cell->mId, CellStore(MWWorld::Cell(*cell), mStore, mReaders)).first->second;
+                result = exteriors.emplace(std::make_pair(x, y), cellStore).first;
+            }
+        }
+        else
+        {
+            throw std::runtime_error("exterior not found: '" + exteriorWorldspace.toDebugString() + "'");
+        }
     }
 
     if (result->second->getState() != CellStore::State_Loaded)
@@ -232,7 +271,7 @@ MWWorld::CellStore& MWWorld::WorldModel::getCell(const ESM::RefId& id)
         return result->second;
 
     if (const auto* exteriorId = id.getIf<ESM::ESM3ExteriorCellRefId>())
-        return getExterior(exteriorId->getX(), exteriorId->getY());
+        return getExterior(exteriorId->getX(), exteriorId->getY(), ESM::Cell::sDefaultWorldspaceId);
 
     const ESM4::Cell* cell4 = mStore.get<ESM4::Cell>().search(id);
     CellStore* newCellStore = nullptr;
@@ -249,7 +288,7 @@ MWWorld::CellStore& MWWorld::WorldModel::getCell(const ESM::RefId& id)
     {
         std::pair<int, int> coord
             = std::make_pair(newCellStore->getCell()->getGridX(), newCellStore->getCell()->getGridY());
-        mExteriors.emplace(coord, newCellStore);
+        mExteriors[newCellStore->getCell()->getWorldSpace()].emplace(coord, newCellStore);
     }
     else
     {
@@ -293,7 +332,7 @@ MWWorld::CellStore& MWWorld::WorldModel::getCell(std::string_view name)
     if (!cell)
         throw std::runtime_error(std::string("Can't find cell with name ") + std::string(name));
 
-    return getExterior(cell->getGridX(), cell->getGridY());
+    return getExterior(cell->getGridX(), cell->getGridY(), ESM::Cell::sDefaultWorldspaceId);
 }
 
 MWWorld::CellStore& MWWorld::WorldModel::getCellByPosition(
@@ -302,7 +341,9 @@ MWWorld::CellStore& MWWorld::WorldModel::getCellByPosition(
     if (cellInSameWorldSpace && !cellInSameWorldSpace->isExterior())
         return *cellInSameWorldSpace;
     const osg::Vec2i cellIndex = positionToCellIndex(pos.x(), pos.y());
-    return getExterior(cellIndex.x(), cellIndex.y());
+    ESM::RefId exteriorWorldspace
+        = cellInSameWorldSpace ? cellInSameWorldSpace->getCell()->getWorldSpace() : ESM::Cell::sDefaultWorldspaceId;
+    return getExterior(cellIndex.x(), cellIndex.y(), exteriorWorldspace);
 }
 
 MWWorld::Ptr MWWorld::WorldModel::getPtr(const ESM::RefId& name, CellStore& cell)
@@ -342,12 +383,14 @@ MWWorld::Ptr MWWorld::WorldModel::getPtr(const ESM::RefId& name)
     // Then check cells that are already listed
     // Search in reverse, this is a workaround for an ambiguous chargen_plank reference in the vanilla game.
     // there is one at -22,16 and one at -2,-9, the latter should be used.
-    for (std::map<std::pair<int, int>, CellStore*>::reverse_iterator iter = mExteriors.rbegin();
-         iter != mExteriors.rend(); ++iter)
+    for (auto iterExt = mExteriors.rbegin(); iterExt != mExteriors.rend(); ++iterExt)
     {
-        Ptr ptr = getPtrAndCache(name, *iter->second);
-        if (!ptr.isEmpty())
-            return ptr;
+        for (auto iter = iterExt->second.rbegin(); iter != iterExt->second.rend(); iter++)
+        {
+            Ptr ptr = getPtrAndCache(name, *iter->second);
+            if (!ptr.isEmpty())
+                return ptr;
+        }
     }
 
     for (auto iter = mInteriors.begin(); iter != mInteriors.end(); ++iter)
diff --git a/apps/openmw/mwworld/worldmodel.hpp b/apps/openmw/mwworld/worldmodel.hpp
index c9c7cf52ea..464cc89d18 100644
--- a/apps/openmw/mwworld/worldmodel.hpp
+++ b/apps/openmw/mwworld/worldmodel.hpp
@@ -42,7 +42,7 @@ namespace MWWorld
         ESM::ReadersCache& mReaders;
         mutable std::unordered_map<ESM::RefId, CellStore> mCells;
         mutable std::map<std::string, CellStore*, Misc::StringUtils::CiComp> mInteriors;
-        mutable std::map<std::pair<int, int>, CellStore*> mExteriors;
+        mutable std::map<ESM::RefId, std::map<std::pair<int, int>, CellStore*>> mExteriors;
         IdCache mIdCache;
         std::size_t mIdCacheIndex = 0;
         std::unordered_map<ESM::RefNum, Ptr> mPtrIndex;
@@ -63,7 +63,7 @@ namespace MWWorld
 
         void clear();
 
-        CellStore& getExterior(int x, int y);
+        CellStore& getExterior(int x, int y, ESM::RefId exteriorWorldSpace);
         CellStore& getInterior(std::string_view name);
         CellStore& getCell(std::string_view name); // interior or named exterior
         CellStore& getCell(const ESM::RefId& Id);
diff --git a/components/esm3/loadcell.cpp b/components/esm3/loadcell.cpp
index 73fd8967bd..6bfb0fe8a1 100644
--- a/components/esm3/loadcell.cpp
+++ b/components/esm3/loadcell.cpp
@@ -40,6 +40,7 @@ namespace ESM
 namespace ESM
 {
     const std::string Cell::sDefaultWorldspace = "sys::default";
+    const RefId Cell::sDefaultWorldspaceId = ESM::RefId::stringRefId(Cell::sDefaultWorldspace);
 
     // Some overloaded compare operators.
     bool operator==(const MovedCellRef& ref, const RefNum& refNum)
diff --git a/components/esm3/loadcell.hpp b/components/esm3/loadcell.hpp
index c889a5a620..c5794aa5a2 100644
--- a/components/esm3/loadcell.hpp
+++ b/components/esm3/loadcell.hpp
@@ -67,6 +67,7 @@ namespace ESM
     struct Cell
     {
         static const std::string sDefaultWorldspace;
+        static const ESM::RefId sDefaultWorldspaceId;
 
         constexpr static RecNameInts sRecordId = REC_CELL;
 
diff --git a/components/esm4/loadwrld.cpp b/components/esm4/loadwrld.cpp
index f421a8e7ff..cc16ab4fa7 100644
--- a/components/esm4/loadwrld.cpp
+++ b/components/esm4/loadwrld.cpp
@@ -34,8 +34,8 @@
 
 void ESM4::World::load(ESM4::Reader& reader)
 {
-    mFormId = reader.hdr().record.getFormId();
-    reader.adjustFormId(mFormId);
+    FormId formid = reader.hdr().record.getFormId();
+    reader.adjustFormId(formid);
     mFlags = reader.hdr().record.flags;
 
     // It should be possible to save the current world formId automatically while reading in
@@ -45,7 +45,8 @@ void ESM4::World::load(ESM4::Reader& reader)
     // Alternatively it may be possible to figure it out by examining the group headers, but
     // apparently the label field is not reliable so the parent world formid may have been
     // corrupted by the use of ignore flag (TODO: should check to verify).
-    reader.setCurrWorld(mFormId); // save for CELL later
+    reader.setCurrWorld(formid); // save for CELL later
+    mId = ESM::FormIdRefId(formid);
 
     std::uint32_t subSize = 0; // for XXXX sub record
 
diff --git a/components/esm4/loadwrld.hpp b/components/esm4/loadwrld.hpp
index f5ba010ba8..7dc42cd035 100644
--- a/components/esm4/loadwrld.hpp
+++ b/components/esm4/loadwrld.hpp
@@ -34,6 +34,9 @@
 #include "formid.hpp"
 #include "grid.hpp"
 
+#include <components/esm/defs.hpp>
+#include <components/esm/refid.hpp>
+
 namespace ESM4
 {
     class Reader;
@@ -81,7 +84,7 @@ namespace ESM4
             float initialPitch;
         };
 
-        FormId mFormId; // from the header
+        ESM::RefId mId; // from the header
         std::uint32_t mFlags; // from the header, see enum type RecordFlag for details
 
         std::string mEditorId;
@@ -129,6 +132,7 @@ namespace ESM4
 
         void load(ESM4::Reader& reader);
         // void save(ESM4::Writer& writer) const;
+        static constexpr ESM::RecNameInts sRecordId = ESM::REC_WRLD4;
     };
 }