diff --git a/layers/mountain_peak/mapping.yaml b/layers/mountain_peak/mapping.yaml
index 21952d17..157ae5c8 100644
--- a/layers/mountain_peak/mapping.yaml
+++ b/layers/mountain_peak/mapping.yaml
@@ -58,3 +58,4 @@ tables:
       - ridge
       - cliff
       - arete
+      - valley
diff --git a/layers/mountain_peak/mapping_diagram.png b/layers/mountain_peak/mapping_diagram.png
index 9e8a3e21..4f7e3a92 100644
Binary files a/layers/mountain_peak/mapping_diagram.png and b/layers/mountain_peak/mapping_diagram.png differ
diff --git a/layers/mountain_peak/mountain_peak.yaml b/layers/mountain_peak/mountain_peak.yaml
index 2b6a3b19..22123e38 100644
--- a/layers/mountain_peak/mountain_peak.yaml
+++ b/layers/mountain_peak/mountain_peak.yaml
@@ -21,6 +21,7 @@ layer:
       - ridge
       - cliff
       - arete
+      - valley
     ele: Elevation (`ele`) in meters.
     ele_ft: Elevation (`ele`) in feet.
     customary_ft: