diff --git a/bin/geoviewer.py b/bin/geoviewer.py
index c77aca6f..a50b2b27 100755
--- a/bin/geoviewer.py
+++ b/bin/geoviewer.py
@@ -181,12 +181,16 @@ def main(test_args: Sequence[str] = None) -> None:
         vmax = None
 
     # color map
+    # Get the list of existing color maps, including reversed maps
+    mpl_cmap_list = list(plt.cm.datad.keys())
+    mpl_cmap_list.extend([cmap + "_r" for cmap in mpl_cmap_list])
+
     if args.cmap == "default":
         cmap = plt.rcParams["image.cmap"]
-    elif args.cmap in plt.cm.datad.keys():
+    elif args.cmap in mpl_cmap_list:
         cmap = args.cmap
     else:
-        raise ValueError("Wrong cmap, must be in: {}".format(",".join(str(elem) for elem in plt.cm.datad.keys())))
+        raise ValueError("Wrong cmap, must be in: {}".format(",".join(str(elem) for elem in mpl_cmap_list)))
 
     # Figsize
     if args.figsize == "default":
diff --git a/tests/test_geoviewer.py b/tests/test_geoviewer.py
index 1763e00c..66cde9da 100644
--- a/tests/test_geoviewer.py
+++ b/tests/test_geoviewer.py
@@ -24,6 +24,7 @@
     (
         (),
         ("-cmap", "Reds"),
+        ("-cmap", "Reds_r"),
         ("-vmin", "-10", "-vmax", "10"),
         ("-vmin", "5%", "-vmax", "95%"),
         ("-band", "1"),