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I've added a new feature to WaterwayMap.org: Loop/cycle detection!

It shows all places where `waterway`s (e.g. rivers) form a loop, and go around in a circle. Most of these are simple tagging mistakes. Please get mapping!

map: waterwaymap.org/loops/

waterwaymap.orgWaterwayMap.org - LoopsLoops & cycles in OpenStreetMap Waterways
Amᵃᵖanda 🔜 FOSSGIS

@tordans 1st one: The OSM Wiki for fish passes says that the linear way is the waterway=fish_pass. For the area (which will have a loop), one should use water=fish_pass.

So that's a tagging mistake