diff --git a/core/src/com/unciv/logic/map/tile/Tile.kt b/core/src/com/unciv/logic/map/tile/Tile.kt
index 1bfa8bef7d..b8fd41573a 100644
--- a/core/src/com/unciv/logic/map/tile/Tile.kt
+++ b/core/src/com/unciv/logic/map/tile/Tile.kt
@@ -512,6 +512,7 @@ class Tile : IsPartOfGameInfoSerialization, Json.Serializable {
             "Land" -> return isLand
             Constants.coastal -> return isCoastalTile()
             Constants.river -> return isAdjacentToRiver()
+            "unowned" -> return getOwner() == null
             "your" -> return observingCiv != null && getOwner() == observingCiv
             "Foreign Land", "Foreign" -> return observingCiv != null && !isFriendlyTerritory(observingCiv)
             "Friendly Land", "Friendly" -> return observingCiv != null && isFriendlyTerritory(observingCiv)
diff --git a/core/src/com/unciv/models/ruleset/unique/UniqueParameterType.kt b/core/src/com/unciv/models/ruleset/unique/UniqueParameterType.kt
index 497acf2573..8aa2153377 100644
--- a/core/src/com/unciv/models/ruleset/unique/UniqueParameterType.kt
+++ b/core/src/com/unciv/models/ruleset/unique/UniqueParameterType.kt
@@ -315,7 +315,7 @@ enum class UniqueParameterType(
         override val staticKnownValues = setOf(
             "Terrain",
             Constants.coastal, Constants.river, "Open terrain", "Rough terrain", "Water resource",
-            "resource", "Foreign Land", "Foreign", "Friendly Land", "Friendly", "Enemy Land", "Enemy", "your",
+            "resource", "Foreign Land", "Foreign", "Friendly Land", "Friendly", "Enemy Land", "Enemy", "your", "unowned",
             "Featureless", Constants.freshWaterFilter, "non-fresh water", "Natural Wonder",
             "Impassable", "Land", "Water"
         ) + ResourceType.entries.map { it.name + " resource" } + Constants.all