diff --git a/map_data/rivers.png b/map_data/rivers.png
index 25a013f..92aac76 100644
--- a/map_data/rivers.png
+++ b/map_data/rivers.png
@@ -1,3 +1,3 @@
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+oid sha256:5d05e1e60bd2f213389a89de8fdae8b08f41b95aa9a6e0e4632d3faf3d50e686
+size 349503