Poplar River is a small community located in Roosevelt County, Montana. It is situated near the Fort Peck Indian Reservation and is primarily inhabited by members of the Assiniboine and Sioux tribes. The area is characterized by its rural landscape and close-knit community. The river itself flows through the region, contributing to the local ecosystem and providing recreational opportunities. Poplar River is also near the larger town of Poplar, which offers additional services and amenities to residents and visitors. The community reflects the rich cultural heritage of the indigenous peoples of the area.