The Flathead Indian Reservation, located in western Montana on the Flathead River, is home to the Bitterroot Salish, Kootenai, and Pend d'Oreilles tribes – also known as the Confederated Salish and Kootenai Tribes of the Flathead Nation. The reservation was created through the July 16, 1855, Treaty of Hellgate. It has land in four of Montana's counties: Lake, Sanders, Missoula, and Flathead, and controls most of Flathead Lake. The Flathead Indian Reservation, west of the Continental Divide, consists of 1,938 square miles (5,020 km2) (1,317,000 acres (533,000 ha)) of forested mountains and valleys.
