Buffalo River State Park is a state park of Minnesota, United States, conserving a prairie bisected by the wooded banks of the Buffalo River. Together with the adjacent Bluestem Prairie Scientific and Natural Area owned by The Nature Conservancy, it protects one of the largest and highest-quality prairie remnants in Minnesota. With the closest swimming lake to the Fargo–Moorhead metropolitan area, however, it is most popular for swimming and picnicking. The 1,068-acre (432 ha) park is located just off U.S.