Marion County Lake is a body of water, 1.5 miles (2.4 km) south-east of Marion, on the western edge of the Flint Hills region of Kansas in the United States. This smaller lake is often confused with the similar named yet larger Marion Reservoir, which is north-west of Marion. Most locals refer to the larger body of water using the term 'Reservoir', and the smaller body of water using the term 'Lake' (this article).