Any named river on OpenStreetMap, worldwide. Rivers are long, so after you pick one you choose the stretch: drag the green and red handles along it, or pick its ends from the towns, boat ramps, put-ins and dams along the river. The famous stretches (the Madison from Quake Lake to Ennis, Paradise Valley on the Yellowstone, the Henry's Fork, the Bighorn, the Holy Water on the Au Sable, the Grand Canyon, the Gauley and more) are ready to tap.
Oct 23, 2026