Flat Lake (South Dakota)
| Flat Lake | |
|---|---|
| Location | Marshall County, South Dakota |
| Coordinates | 45°47′59″N 97°24′17″W / 45.7996125°N 97.4047801°W |
| Type | lake |
| Surface elevation | 1,873 feet (571 m) |
Flat Lake is a natural lake in South Dakota, in the United States.
Flat Lake received its name from the flat terrain of the site.