Columbus Riverwalk, Columbus, Georgia, United States. This is one of my favorite places ever. Across the river is Alabama. If you continue a mile or two down the 12 mile walk, it is uninhabited Alabama. When the water is low, this area has all kinds of exposed rock with turtles and cranes darting atop them. Gorgeous. The river is the Chattahoochee, which runs from North Georgia through Atlanta down to the panhandle of Florida.