diff --git a/android/assets/jsons/translations/template.properties b/android/assets/jsons/translations/template.properties
index 68b29fb713..57ae9a5d48 100644
--- a/android/assets/jsons/translations/template.properties
+++ b/android/assets/jsons/translations/template.properties
@@ -272,6 +272,8 @@ Civilizations =
 Map Type = 
 Map file = 
 Could not load map! = 
+Invalid map: Area ([area]) does not match saved dimensions ([dimensions]). = 
+The dimensions have now been fixed for you. = 
 Generated = 
 Existing = 
 Custom = 
@@ -310,7 +312,6 @@ Rare features richness =
 Max Coast extension = 
 Biome areas extension = 
 Water level = 
-Reset to default = 
 
 Online Multiplayer = 
 
diff --git a/core/src/com/unciv/logic/MapSaver.kt b/core/src/com/unciv/logic/MapSaver.kt
index 8642d349f1..898021be4e 100644
--- a/core/src/com/unciv/logic/MapSaver.kt
+++ b/core/src/com/unciv/logic/MapSaver.kt
@@ -10,17 +10,27 @@ object MapSaver {
     fun json() = GameSaver.json()
 
     private const val mapsFolder = "maps"
-    private const val saveZipped = true
+    var saveZipped = true
 
     private fun getMap(mapName:String) = Gdx.files.local("$mapsFolder/$mapName")
 
-    fun mapFromSavedString(mapString: String): TileMap {
+    fun mapFromSavedString(mapString: String, checkSizeErrors: Boolean = true): TileMap {
         val unzippedJson = try {
             Gzip.unzip(mapString)
         } catch (ex: Exception) {
             mapString
         }
-        return mapFromJson(unzippedJson)
+        return mapFromJson(unzippedJson).apply {
+            // old maps (rarely) can come with mapSize fields not matching tile list
+            if (checkSizeErrors && mapParameters.getArea() != values.size)
+                throw UncivShowableException("Invalid map: Area ([${values.size}]) does not match saved dimensions ([${mapParameters.displayMapDimensions()}]).")
+            // compatibility with rare maps saved with old mod names
+            if (!checkSizeErrors)
+                mapParameters.mods.filter { '-' in it }.forEach {
+                    mapParameters.mods.remove(it)
+                    mapParameters.mods.add(it.replace('-',' '))
+                }
+        }
     }
     fun mapToSavedString(tileMap: TileMap): String {
         val mapJson = json().toJson(tileMap)
@@ -31,8 +41,8 @@ object MapSaver {
         getMap(mapName).writeString(mapToSavedString(tileMap), false)
     }
 
-    fun loadMap(mapFile:FileHandle):TileMap {
-        return mapFromSavedString(mapFile.readString())
+    fun loadMap(mapFile:FileHandle, checkSizeErrors: Boolean = true):TileMap {
+        return mapFromSavedString(mapFile.readString(), checkSizeErrors)
     }
 
     fun getMaps(): Array<FileHandle> = Gdx.files.local(mapsFolder).list()
diff --git a/core/src/com/unciv/logic/map/MapParameters.kt b/core/src/com/unciv/logic/map/MapParameters.kt
index c25b524588..fa3b7f2348 100644
--- a/core/src/com/unciv/logic/map/MapParameters.kt
+++ b/core/src/com/unciv/logic/map/MapParameters.kt
@@ -3,6 +3,7 @@ package com.unciv.logic.map
 import com.unciv.Constants
 import com.unciv.logic.HexMath.getEquivalentHexagonalRadius
 import com.unciv.logic.HexMath.getEquivalentRectangularSize
+import com.unciv.logic.HexMath.getNumberOfTilesInHexagon
 
 
 enum class MapSize(val radius: Int, val width: Int, val height: Int) {
@@ -44,10 +45,7 @@ class MapSizeNew {
 
     constructor(radius: Int) {
         name = Constants.custom
-        this.radius = radius
-        val size = getEquivalentRectangularSize(radius)
-        this.width = size.x.toInt()
-        this.height = size.y.toInt()
+        setNewRadius(radius)
     }
 
     constructor(width: Int, height: Int) {
@@ -86,20 +84,24 @@ class MapSizeNew {
         } ?: return null
 
         // fix the size - not knowing whether hexagonal or rectangular is used
-        radius = when {
+        setNewRadius(when {
             radius < 2 -> 2
             radius > 500 -> 500
             worldWrap && radius < 15 -> 15    // minimum for hexagonal but more than required for rectangular
             else -> radius
-        }
-        val size = getEquivalentRectangularSize(radius)
-        width = size.x.toInt()
-        height = size.y.toInt()
+        })
 
         // tell the caller that map dimensions have changed and why
         return message
     }
 
+    private fun setNewRadius(radius: Int) {
+        this.radius = radius
+        val size = getEquivalentRectangularSize(radius)
+        width = size.x.toInt()
+        height = size.y.toInt()
+    }
+
     // For debugging and MapGenerator console output
     override fun toString() = if (name == Constants.custom) "${width}x${height}" else name
 }
@@ -138,6 +140,9 @@ class MapParameters {
     /** This is used mainly for the map editor, so you can continue editing a map under the same ruleset you started with */
     var mods = LinkedHashSet<String>()
 
+    /** Unciv Version of creation for support cases */
+    var createdWithVersion = ""
+
     var seed: Long = System.currentTimeMillis()
     var tilesPerBiomeArea = 6
     var maxCoastExtension = 2
@@ -166,6 +171,7 @@ class MapParameters {
         it.rareFeaturesRichness = rareFeaturesRichness
         it.resourceRichness = resourceRichness
         it.waterThreshold = waterThreshold
+        it.createdWithVersion = createdWithVersion
     }
 
     fun reseed() {
@@ -184,14 +190,26 @@ class MapParameters {
         waterThreshold = 0f
     }
 
+    fun getArea() = when {
+        shape == MapShape.hexagonal -> getNumberOfTilesInHexagon(mapSize.radius)
+        worldWrap && mapSize.width % 2 != 0 -> (mapSize.width - 1) * mapSize.height
+        else -> mapSize.width * mapSize.height
+    }
+    fun displayMapDimensions() = mapSize.run {
+        (if (shape == MapShape.hexagonal) "R$radius" else "${width}x$height") +
+        (if (worldWrap) "w" else "")
+    }
+
     // For debugging and MapGenerator console output
     override fun toString() = sequence {
         if (name.isNotEmpty()) yield("\"$name\" ")
-        yield("($mapSize ")
+        yield("(")
+        if (mapSize.name != Constants.custom) yield(mapSize.name + " ")
         if (worldWrap) yield("wrapped ")
         yield(shape)
+        yield(" " + displayMapDimensions())
         if (name.isEmpty()) return@sequence
-        yield(" $type, Seed $seed, ")
+        yield(", $type, Seed $seed, ")
         yield("$elevationExponent/$temperatureExtremeness/$resourceRichness/$vegetationRichness/")
         yield("$rareFeaturesRichness/$maxCoastExtension/$tilesPerBiomeArea/$waterThreshold")
     }.joinToString("", postfix = ")")
diff --git a/core/src/com/unciv/logic/map/TileMap.kt b/core/src/com/unciv/logic/map/TileMap.kt
index 044993a2b6..bf8415bce7 100644
--- a/core/src/com/unciv/logic/map/TileMap.kt
+++ b/core/src/com/unciv/logic/map/TileMap.kt
@@ -2,6 +2,7 @@ package com.unciv.logic.map
 
 import com.badlogic.gdx.math.Vector2
 import com.unciv.Constants
+import com.unciv.UncivGame
 import com.unciv.logic.GameInfo
 import com.unciv.logic.HexMath
 import com.unciv.logic.civilization.CivilizationInfo
@@ -96,7 +97,7 @@ class TileMap {
         startingLocations.clear()
 
         // world-wrap maps must always have an even width, so round down
-        val wrapAdjustedWidth = if (worldWrap && width % 2 != 0 ) width -1 else width
+        val wrapAdjustedWidth = if (worldWrap && width % 2 != 0) width -1 else width
 
         // Even widths will have coordinates ranging -x..(x-1), not -x..x, which is always an odd-sized range
         // e.g. w=4 -> -2..1, w=5 -> -2..2, w=6 -> -3..2, w=7 -> -3..3
@@ -153,7 +154,7 @@ class TileMap {
      *  Respects map edges and world wrap. */
     fun getTilesInDistance(origin: Vector2, distance: Int): Sequence<TileInfo> =
             getTilesInDistanceRange(origin, 0..distance)
-    
+
     /** @return All tiles in a hexagonal ring around [origin] with the distances in [range]. Excludes the [origin] tile unless [range] starts at 0.
      *  Respects map edges and world wrap. */
     fun getTilesInDistanceRange(origin: Vector2, range: IntRange): Sequence<TileInfo> =
diff --git a/core/src/com/unciv/logic/map/mapgenerator/MapGenerator.kt b/core/src/com/unciv/logic/map/mapgenerator/MapGenerator.kt
index 6cfa4d65ba..0107ff72ff 100644
--- a/core/src/com/unciv/logic/map/mapgenerator/MapGenerator.kt
+++ b/core/src/com/unciv/logic/map/mapgenerator/MapGenerator.kt
@@ -1,6 +1,7 @@
 package com.unciv.logic.map.mapgenerator
 
 import com.unciv.Constants
+import com.unciv.UncivGame
 import com.unciv.logic.HexMath
 import com.unciv.logic.map.*
 import com.unciv.models.Counter
@@ -38,6 +39,7 @@ class MapGenerator(val ruleset: Ruleset) {
         else
             TileMap(mapSize.radius, ruleset, mapParameters.worldWrap)
 
+        mapParameters.createdWithVersion = UncivGame.Current.version
         map.mapParameters = mapParameters
 
         if (mapType == MapType.empty) {
diff --git a/core/src/com/unciv/ui/mapeditor/MapEditorScreen.kt b/core/src/com/unciv/ui/mapeditor/MapEditorScreen.kt
index ed4f813340..ca0d93184d 100644
--- a/core/src/com/unciv/ui/mapeditor/MapEditorScreen.kt
+++ b/core/src/com/unciv/ui/mapeditor/MapEditorScreen.kt
@@ -1,16 +1,21 @@
 package com.unciv.ui.mapeditor
 
+import com.badlogic.gdx.Gdx
 import com.badlogic.gdx.graphics.Color
 import com.badlogic.gdx.math.Vector2
 import com.badlogic.gdx.scenes.scene2d.InputEvent
 import com.badlogic.gdx.scenes.scene2d.InputListener
 import com.badlogic.gdx.scenes.scene2d.actions.Actions
 import com.unciv.UncivGame
+import com.unciv.logic.HexMath
+import com.unciv.logic.map.MapShape
+import com.unciv.logic.map.MapSizeNew
 import com.unciv.logic.map.TileInfo
 import com.unciv.logic.map.TileMap
 import com.unciv.models.ruleset.Ruleset
 import com.unciv.models.ruleset.RulesetCache
 import com.unciv.models.metadata.GameSetupInfo
+import com.unciv.models.translations.tr
 import com.unciv.ui.utils.*
 
 class MapEditorScreen(): CameraStageBaseScreen() {
@@ -28,6 +33,7 @@ class MapEditorScreen(): CameraStageBaseScreen() {
 
     constructor(map: TileMap) : this() {
         tileMap = map
+        checkAndFixMapSize()
         ruleset = RulesetCache.getComplexRuleset(map.mapParameters.mods)
         initialize()
     }
@@ -136,11 +142,34 @@ class MapEditorScreen(): CameraStageBaseScreen() {
         })
     }
 
+    private fun checkAndFixMapSize() {
+        val areaFromTiles = tileMap.values.size
+        tileMap.mapParameters.run {
+            val areaFromSize = getArea()
+            if (areaFromSize == areaFromTiles) return
+            Gdx.app.postRunnable {
+                val message = ("Invalid map: Area ([$areaFromTiles]) does not match saved dimensions ([" +
+                        displayMapDimensions() + "]).").tr() +
+                        "\n" + "The dimensions have now been fixed for you.".tr()
+                ToastPopup(message, this@MapEditorScreen, 4000L )
+            }
+            if (shape == MapShape.hexagonal) {
+                mapSize = MapSizeNew(HexMath.getHexagonalRadiusForArea(areaFromTiles).toInt())
+                return
+            }
+
+            // These mimic tileMap.max* without the abs()
+            val minLatitude = (tileMap.values.map { it.latitude }.minOrNull() ?: 0f).toInt()
+            val minLongitude = (tileMap.values.map { it.longitude }.minOrNull() ?: 0f).toInt()
+            val maxLatitude = (tileMap.values.map { it.latitude }.maxOrNull() ?: 0f).toInt()
+            val maxLongitude = (tileMap.values.map { it.longitude }.maxOrNull() ?: 0f).toInt()
+            mapSize = MapSizeNew((maxLongitude - minLongitude + 1), (maxLatitude - minLatitude + 1) / 2)
+        }
+    }
+
     override fun resize(width: Int, height: Int) {
         if (stage.viewport.screenWidth != width || stage.viewport.screenHeight != height) {
             game.setScreen(MapEditorScreen(mapHolder.tileMap))
         }
     }
 }
-
-
diff --git a/core/src/com/unciv/ui/mapeditor/SaveAndLoadMapScreen.kt b/core/src/com/unciv/ui/mapeditor/SaveAndLoadMapScreen.kt
index 7afb4630ed..0a1533dd64 100644
--- a/core/src/com/unciv/ui/mapeditor/SaveAndLoadMapScreen.kt
+++ b/core/src/com/unciv/ui/mapeditor/SaveAndLoadMapScreen.kt
@@ -7,6 +7,7 @@ import com.badlogic.gdx.scenes.scene2d.ui.Table
 import com.badlogic.gdx.scenes.scene2d.ui.TextButton
 import com.badlogic.gdx.scenes.scene2d.ui.TextField
 import com.unciv.logic.MapSaver
+import com.unciv.logic.UncivShowableException
 import com.unciv.logic.map.MapType
 import com.unciv.logic.map.TileMap
 import com.unciv.models.ruleset.RulesetCache
@@ -64,7 +65,8 @@ class SaveAndLoadMapScreen(mapToSave: TileMap?, save:Boolean = false, previousSc
                         }
                     }
                     try {
-                        val map = MapSaver.loadMap(chosenMap!!)
+                        val map = MapSaver.loadMap(chosenMap!!, checkSizeErrors = false)
+
                         val missingMods = map.mapParameters.mods.filter { it !in RulesetCache }
                         if (missingMods.isNotEmpty()) {
                             Gdx.app.postRunnable {
@@ -90,7 +92,8 @@ class SaveAndLoadMapScreen(mapToSave: TileMap?, save:Boolean = false, previousSc
                         Gdx.app.postRunnable {
                             popup?.close()
                             println("Error loading map \"$chosenMap\": ${ex.localizedMessage}")
-                            ToastPopup("Error loading map!", this)
+                            ToastPopup("Error loading map!".tr() +
+                                (if (ex is UncivShowableException) "\n" + ex.message else ""), this)
                         }
                     }
                 }
@@ -128,7 +131,7 @@ class SaveAndLoadMapScreen(mapToSave: TileMap?, save:Boolean = false, previousSc
             val loadFromClipboardAction = {
                 try {
                     val clipboardContentsString = Gdx.app.clipboard.contents.trim()
-                    val loadedMap = MapSaver.mapFromSavedString(clipboardContentsString)
+                    val loadedMap = MapSaver.mapFromSavedString(clipboardContentsString, checkSizeErrors = false)
                     game.setScreen(MapEditorScreen(loadedMap))
                 } catch (ex: Exception) {
                     couldNotLoadMapLabel.isVisible = true
diff --git a/core/src/com/unciv/ui/newgamescreen/MapOptionsTable.kt b/core/src/com/unciv/ui/newgamescreen/MapOptionsTable.kt
index b933186641..3c9d128cda 100644
--- a/core/src/com/unciv/ui/newgamescreen/MapOptionsTable.kt
+++ b/core/src/com/unciv/ui/newgamescreen/MapOptionsTable.kt
@@ -6,6 +6,7 @@ import com.badlogic.gdx.scenes.scene2d.ui.SelectBox
 import com.badlogic.gdx.scenes.scene2d.ui.Table
 import com.badlogic.gdx.utils.Array
 import com.unciv.logic.MapSaver
+import com.unciv.logic.UncivShowableException
 import com.unciv.logic.map.MapType
 import com.unciv.logic.map.TileMap
 import com.unciv.ui.utils.CameraStageBaseScreen
@@ -90,7 +91,9 @@ class MapOptionsTable(private val newGameScreen: NewGameScreen): Table() {
                 map = MapSaver.loadMap(mapFile)
             } catch (ex:Exception){
                 Popup(newGameScreen).apply {
-                    addGoodSizedLabel("Could not load map!")
+                    addGoodSizedLabel("Could not load map!").row()
+                    if (ex is UncivShowableException)
+                        addGoodSizedLabel(ex.message!!).row()
                     addCloseButton()
                     open()
                 }
diff --git a/core/src/com/unciv/ui/newgamescreen/MapParametersTable.kt b/core/src/com/unciv/ui/newgamescreen/MapParametersTable.kt
index e381c1b03b..27067635ba 100644
--- a/core/src/com/unciv/ui/newgamescreen/MapParametersTable.kt
+++ b/core/src/com/unciv/ui/newgamescreen/MapParametersTable.kt
@@ -252,7 +252,7 @@ class MapParametersTable(
         addSlider("Water level", {mapParameters.waterThreshold}, -0.1f, 0.1f)
         { mapParameters.waterThreshold = it }
 
-        val resetToDefaultButton = "Reset to default".toTextButton()
+        val resetToDefaultButton = "Reset to defaults".toTextButton()
         resetToDefaultButton.onClick {
             mapParameters.resetAdvancedSettings()
             seedTextField.text = mapParameters.seed.toString()
diff --git a/core/src/com/unciv/ui/newgamescreen/NewGameScreen.kt b/core/src/com/unciv/ui/newgamescreen/NewGameScreen.kt
index d1e3935856..4df6176f44 100644
--- a/core/src/com/unciv/ui/newgamescreen/NewGameScreen.kt
+++ b/core/src/com/unciv/ui/newgamescreen/NewGameScreen.kt
@@ -4,6 +4,7 @@ import com.badlogic.gdx.Gdx
 import com.badlogic.gdx.graphics.Color
 import com.badlogic.gdx.scenes.scene2d.ui.SelectBox
 import com.badlogic.gdx.scenes.scene2d.ui.Skin
+import com.badlogic.gdx.scenes.scene2d.ui.VerticalGroup
 import com.badlogic.gdx.utils.Array
 import com.unciv.UncivGame
 import com.unciv.logic.*
@@ -45,8 +46,8 @@ class NewGameScreen(
         updateRuleset()
 
         if (UncivGame.Current.settings.lastGameSetup != null) {
+            rightSideGroup.addActorAt(0, VerticalGroup().padBottom(5f))
             val resetToDefaultsButton = "Reset to defaults".toTextButton()
-            resetToDefaultsButton.padBottom(5f)
             rightSideGroup.addActorAt(0, resetToDefaultsButton)
             resetToDefaultsButton.onClick {
                 game.setScreen(NewGameScreen(previousScreen, GameSetupInfo()))
@@ -80,10 +81,16 @@ class NewGameScreen(
 
             Gdx.input.inputProcessor = null // remove input processing - nothing will be clicked!
 
-            if (mapOptionsTable.mapTypeSelectBox.selected.value == MapType.custom){
-                val map = MapSaver.loadMap(gameSetupInfo.mapFile!!)
-                val rulesetIncompatibilities = map.getRulesetIncompatibility(ruleset)
+            if (mapOptionsTable.mapTypeSelectBox.selected.value == MapType.custom) {
+                val map = try {
+                    MapSaver.loadMap(gameSetupInfo.mapFile!!)
+                } catch (ex: Throwable) {
+                    game.setScreen(this)
+                    ToastPopup("Could not load map!", this)
+                    return@onClick
+                }
 
+                val rulesetIncompatibilities = map.getRulesetIncompatibility(ruleset)
                 if (rulesetIncompatibilities.isNotEmpty()) {
                     val incompatibleMap = Popup(this)
                     incompatibleMap.addGoodSizedLabel("Map is incompatible with the chosen ruleset!".tr()).row()
diff --git a/core/src/com/unciv/ui/worldscreen/mainmenu/OptionsPopup.kt b/core/src/com/unciv/ui/worldscreen/mainmenu/OptionsPopup.kt
index 298006dca7..58d7452a69 100644
--- a/core/src/com/unciv/ui/worldscreen/mainmenu/OptionsPopup.kt
+++ b/core/src/com/unciv/ui/worldscreen/mainmenu/OptionsPopup.kt
@@ -11,6 +11,7 @@ import com.badlogic.gdx.utils.Align
 import com.unciv.Constants
 import com.unciv.MainMenuScreen
 import com.unciv.UncivGame
+import com.unciv.logic.MapSaver
 import com.unciv.logic.civilization.PlayerType
 import com.unciv.models.UncivSound
 import com.unciv.models.metadata.BaseRuleset
@@ -314,6 +315,9 @@ class OptionsPopup(val previousScreen: CameraStageBaseScreen) : Popup(previousSc
                 game.gameInfo.gameParameters.godMode = it
             }).row()
         }
+        add("Save maps compressed".toCheckBox(MapSaver.saveZipped) {
+            MapSaver.saveZipped = it
+        }).row()
     }
 
     //endregion