diff --git a/data/core/terrain-graphics/_final.cfg b/data/core/terrain-graphics/_final.cfg
index 10100807baa..93fc0b547e3 100644
--- a/data/core/terrain-graphics/_final.cfg
+++ b/data/core/terrain-graphics/_final.cfg
@@ -844,6 +844,9 @@
 {TERRAIN_ADJACENT_CORNER     (Cud,Kud)           (!,Cud,Kud,Xu,Ql,Qxu)    Ql       52,76 lava-dcastle-ccw}
 {TERRAIN_ADJACENT_CORNER     (Cud,Kud)           Ql          (!,Cud,Kud,Xu,Ql,Qxu) 52,76 lava-dcastle-cw}
 
+#chasm-water transitions
+
+{TERRAIN_ADJACENT_CORNER_BOTH  Qxu              (W*)                                   chasm}
 
 #castle-lava-chasm transitions