diff --git a/engine/src/map/tile.gd b/engine/src/map/tile.gd
index 80c6708b..fcd5eee3 100644
--- a/engine/src/map/tile.gd
+++ b/engine/src/map/tile.gd
@@ -8,8 +8,11 @@ const ImprovementScript: GDScript = preload("res://engine/src/entities/improveme
 var biome_id: String = ""  # biome classification result
 var substrate_id: String = ""  # geological substrate from elevation
 var water_body_id: int = -1  # water body index (-1 if land)
+var water_body_type: String = ""  # pond/river/lake/large_lake/ocean
 var depth_from_coast: int = -1  # BFS distance from land (-1 if land)
 var soil_type: String = ""  # rocky/sandy/clay/loam/peat/volcanic_ash/permafrost
+var is_river_mouth: bool = false  # true if water tile adjacent to both river and ocean
+var has_cave: bool = false  # true if cave system present (mountain/highland with geology marker)
 
 ## Axial coordinates (q, r) — primary position key
 var position: Vector2i = Vector2i.ZERO
@@ -361,10 +364,16 @@ func to_dict() -> Dictionary:
 		data["substrate_id"] = substrate_id
 	if water_body_id != -1:
 		data["water_body_id"] = water_body_id
+	if water_body_type != "":
+		data["water_body_type"] = water_body_type
 	if depth_from_coast != -1:
 		data["depth_from_coast"] = depth_from_coast
 	if soil_type != "":
 		data["soil_type"] = soil_type
+	if is_river_mouth:
+		data["is_river_mouth"] = true
+	if has_cave:
+		data["has_cave"] = true
 	if resource_id != "":
 		data["resource_id"] = resource_id
 	if improvement != "":
@@ -478,8 +487,11 @@ static func from_dict(data: Dictionary) -> Resource:  # Tile
 	var tile: Resource = SelfScript.new(pos, data.get("biome_id", ""))
 	tile.substrate_id = data.get("substrate_id", "")
 	tile.water_body_id = data.get("water_body_id", -1)
+	tile.water_body_type = data.get("water_body_type", "")
 	tile.depth_from_coast = data.get("depth_from_coast", -1)
 	tile.soil_type = data.get("soil_type", "")
+	tile.is_river_mouth = data.get("is_river_mouth", false)
+	tile.has_cave = data.get("has_cave", false)
 	tile.resource_id = data.get("resource_id", "")
 	tile.improvement = data.get("improvement", "")
 	tile.owner = data.get("owner", -1)