diff --git a/src/openrct2-ui/windows/Ride.cpp b/src/openrct2-ui/windows/Ride.cpp
index 2531a66c25..9784d501b5 100644
--- a/src/openrct2-ui/windows/Ride.cpp
+++ b/src/openrct2-ui/windows/Ride.cpp
@@ -5788,7 +5788,7 @@ private:
         // Scale modifier
         if (listType == GRAPH_ALTITUDE)
         {
-            yUnit -= GetGameState().MapBaseZ * 3;
+            yUnit -= kMapBaseZ * 3;
         }
 
         for (int32_t y = widget->height() - 13; y >= 8; y -= yInterval, yUnit += yUnitInterval)
diff --git a/src/openrct2/GameState.h b/src/openrct2/GameState.h
index e1229b3a95..14dbfe821e 100644
--- a/src/openrct2/GameState.h
+++ b/src/openrct2/GameState.h
@@ -66,7 +66,6 @@ namespace OpenRCT2
         uint8_t BankLoanInterestRate;
         money64 MaxBankLoan;
         random_engine_t ScenarioRand;
-        int32_t MapBaseZ;
         TileCoordsXY MapSize;
 
         SCENARIO_CATEGORY ScenarioCategory;
diff --git a/src/openrct2/paint/tile_element/Paint.Entrance.cpp b/src/openrct2/paint/tile_element/Paint.Entrance.cpp
index 6ba8fb5a2a..a865575f97 100644
--- a/src/openrct2/paint/tile_element/Paint.Entrance.cpp
+++ b/src/openrct2/paint/tile_element/Paint.Entrance.cpp
@@ -347,7 +347,7 @@ static void PaintHeightMarkers(PaintSession& session, const EntranceElement& ent
             ImageIndex baseImageIndex = SPR_HEIGHT_MARKER_BASE;
             baseImageIndex += heightMarkerBaseZ / 16;
             baseImageIndex += GetHeightMarkerOffset();
-            baseImageIndex -= GetGameState().MapBaseZ;
+            baseImageIndex -= kMapBaseZ;
             auto imageId = ImageId(baseImageIndex, COLOUR_GREY);
             PaintAddImageAsParent(session, imageId, { 16, 16, height }, { { 31, 31, heightMarkerBaseZ + 64 }, { 1, 1, 0 } });
         }
diff --git a/src/openrct2/paint/tile_element/Paint.Path.cpp b/src/openrct2/paint/tile_element/Paint.Path.cpp
index 6cddd3631f..85c4266deb 100644
--- a/src/openrct2/paint/tile_element/Paint.Path.cpp
+++ b/src/openrct2/paint/tile_element/Paint.Path.cpp
@@ -761,7 +761,7 @@ static void PaintHeightMarkers(PaintSession& session, const PathElement& pathEl)
         uint32_t baseImageIndex = SPR_HEIGHT_MARKER_BASE;
         baseImageIndex += heightMarkerBaseZ / 16;
         baseImageIndex += GetHeightMarkerOffset();
-        baseImageIndex -= GetGameState().MapBaseZ;
+        baseImageIndex -= kMapBaseZ;
         auto imageId = ImageId(baseImageIndex, COLOUR_GREY);
         PaintAddImageAsParent(session, imageId, { 16, 16, heightMarkerBaseZ }, { 1, 1, 0 });
     }
diff --git a/src/openrct2/paint/tile_element/Paint.Surface.cpp b/src/openrct2/paint/tile_element/Paint.Surface.cpp
index 4e535c7a0f..e872b87b9f 100644
--- a/src/openrct2/paint/tile_element/Paint.Surface.cpp
+++ b/src/openrct2/paint/tile_element/Paint.Surface.cpp
@@ -1132,7 +1132,7 @@ void PaintSurface(PaintSession& session, uint8_t direction, uint16_t height, con
 
         int32_t image_id = (SPR_HEIGHT_MARKER_BASE + dx / 16);
         image_id += GetHeightMarkerOffset();
-        image_id -= OpenRCT2::GetGameState().MapBaseZ;
+        image_id -= kMapBaseZ;
 
         PaintAddImageAsParent(session, ImageId(image_id, COLOUR_OLIVE_GREEN), { 16, 16, surfaceHeight }, { 1, 1, 0 });
     }
diff --git a/src/openrct2/rct1/S4Importer.cpp b/src/openrct2/rct1/S4Importer.cpp
index f1a896458f..c504d03540 100644
--- a/src/openrct2/rct1/S4Importer.cpp
+++ b/src/openrct2/rct1/S4Importer.cpp
@@ -1500,8 +1500,6 @@ namespace RCT1
 
         void ImportTileElements()
         {
-            GetGameState().MapBaseZ = 7;
-
             // Build tile pointer cache (needed to get the first element at a certain location)
             auto tilePointerIndex = TilePointerIndex<RCT12TileElement>(
                 Limits::MaxMapSize, _s4.TileElements, std::size(_s4.TileElements));
diff --git a/src/openrct2/rct2/S6Importer.cpp b/src/openrct2/rct2/S6Importer.cpp
index 58cdcbb10b..954ece5a05 100644
--- a/src/openrct2/rct2/S6Importer.cpp
+++ b/src/openrct2/rct2/S6Importer.cpp
@@ -410,7 +410,6 @@ namespace RCT2
             // rct1_water_colour
             // Pad01358842
             ImportResearchList(gameState);
-            gameState.MapBaseZ = _s6.MapBaseZ;
             gameState.BankLoanInterestRate = _s6.CurrentInterestRate;
             // Pad0135934B
             // Preserve compatibility with vanilla RCT2's save format.
diff --git a/src/openrct2/ride/TrackPaint.cpp b/src/openrct2/ride/TrackPaint.cpp
index 76ce08c9a4..e8a77091ec 100644
--- a/src/openrct2/ride/TrackPaint.cpp
+++ b/src/openrct2/ride/TrackPaint.cpp
@@ -2235,7 +2235,7 @@ void PaintTrack(PaintSession& session, Direction direction, int32_t height, cons
                 uint16_t ax = ride->GetRideTypeDescriptor().Heights.VehicleZOffset;
                 // 0x1689 represents 0 height there are -127 to 128 heights above and below it
                 // There are 3 arrays of 256 heights (units, m, ft) chosen with the GetHeightMarkerOffset()
-                auto heightNum = (height + 8) / 16 - GetGameState().MapBaseZ;
+                auto heightNum = (height + 8) / 16 - kMapBaseZ;
                 auto imageId = ImageId(SPR_HEIGHT_MARKER_BASE + GetHeightMarkerOffset() + heightNum, COLOUR_LIGHT_BLUE);
 
                 PaintAddImageAsParent(session, imageId, { 16, 16, height + ax + 3 }, { { 1000, 1000, 2047 }, { 1, 1, 0 } });
diff --git a/src/openrct2/world/Map.cpp b/src/openrct2/world/Map.cpp
index 3cdb9ba1bf..b501fca43d 100644
--- a/src/openrct2/world/Map.cpp
+++ b/src/openrct2/world/Map.cpp
@@ -464,7 +464,6 @@ void MapInit(const TileCoordsXY& size)
     gGrassSceneryTileLoopPosition = 0;
     gWidePathTileLoopPosition = {};
     gameState.MapSize = size;
-    gameState.MapBaseZ = 7;
     MapRemoveOutOfRangeElements();
     MapAnimationAutoCreate();
 
diff --git a/src/openrct2/world/Map.h b/src/openrct2/world/Map.h
index 2a29ce9f88..0aa3fffa29 100644
--- a/src/openrct2/world/Map.h
+++ b/src/openrct2/world/Map.h
@@ -20,6 +20,10 @@ constexpr uint8_t MINIMUM_LAND_HEIGHT = 2;
 constexpr uint8_t MAXIMUM_LAND_HEIGHT = 254;
 constexpr uint8_t MINIMUM_WATER_HEIGHT = 2;
 constexpr uint8_t MAXIMUM_WATER_HEIGHT = 254;
+/**
+ * The land height that counts as 0 metres/feet for the land height labels and altitude graphs.
+ */
+constexpr uint8_t kMapBaseZ = 7;
 
 #define MINIMUM_MAP_SIZE_TECHNICAL 5
 #define MAXIMUM_MAP_SIZE_TECHNICAL 1001