diff --git a/src/terrain_translation.cpp b/src/terrain_translation.cpp
index 5d36ffe1378..836062b141e 100644
--- a/src/terrain_translation.cpp
+++ b/src/terrain_translation.cpp
@@ -127,7 +127,17 @@ namespace t_translation {
 static std::map<t_letter, t_letter> lookup_table_131;
 #endif
 
-const t_letter OFF_MAP = string_to_number_("_off");
+const t_letter OFF_MAP = string_to_number_("_off^_off");
+const t_letter OFF_MAP_USER = string_to_number_("_off^_usr");
+const t_letter OFF_MAP_BORDER_LEFT = string_to_number_("_off^bl");
+const t_letter OFF_MAP_BORDER_RIGHT = string_to_number_("_off^br");
+const t_letter OFF_MAP_BORDER_TOP = string_to_number_("_off^bt");
+const t_letter OFF_MAP_BORDER_TOP_LEFT = string_to_number_("_off^btl");
+const t_letter OFF_MAP_BORDER_TOP_RIGHT = string_to_number_("_off^btr");
+const t_letter OFF_MAP_BORDER_BOTTOM = string_to_number_("_off^bb");
+const t_letter OFF_MAP_BORDER_BOTTOM_LEFT = string_to_number_("_off^bbl");
+const t_letter OFF_MAP_BORDER_BOTTOM_RIGHT = string_to_number_("_off^bbr");
+
 const t_letter VOID_TERRAIN = string_to_number_("_s");
 const t_letter FOGGED = string_to_number_("_f");
 
diff --git a/src/terrain_translation.hpp b/src/terrain_translation.hpp
index e845864392f..6e23bfaf871 100644
--- a/src/terrain_translation.hpp
+++ b/src/terrain_translation.hpp
@@ -105,6 +105,24 @@ namespace t_translation {
 	extern const t_letter VOID_TERRAIN;
 	extern const t_letter FOGGED;
 
+	// these terrains are defined but not used yet.
+	// Needed for the new border transitions
+	
+	// off the map and outside the border
+	extern const t_letter OFF_MAP;
+	// on the map the user can use this type to make odd shaped maps good
+	extern const t_letter OFF_MAP_USER;
+	// border tiles differnt type to make it easier for WML to detect the
+	// position on the border
+	extern const t_letter OFF_MAP_BORDER_LEFT;
+	extern const t_letter OFF_MAP_BORDER_RIGHT;
+	extern const t_letter OFF_MAP_BORDER_TOP;
+	extern const t_letter OFF_MAP_BORDER_TOP_LEFT;
+	extern const t_letter OFF_MAP_BORDER_TOP_RIGHT;
+	extern const t_letter OFF_MAP_BORDER_BOTTOM;
+	extern const t_letter OFF_MAP_BORDER_BOTTOM_LEFT;
+	extern const t_letter OFF_MAP_BORDER_BOTTOM_RIGHT;
+
 	extern const t_letter HUMAN_CASTLE;
 	extern const t_letter HUMAN_KEEP;
 	extern const t_letter SHALLOW_WATER;