Flat River (Missouri)

The Flat River is a stream in St. Francois County, Missouri. It is a tributary of the Big River.

The stream source is at: 37.77056°N, -90.58889°W and the confluence is at: 37.89194°N, -90.49972°W.

Flat River was so named on account of its flat banks. A variant name was "River la Platte".