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, and reservation has land on four of Montana's counties: Lake, Sanders, Missoula, and Flathead. The Flathead Indian Reservation, west of the Continental Divide, consists of 1938sqmi (1317000acres) of forested mountains and valleys.HistoryNative Americans have lived in Montana for more than 14,000 years, based on archaeological findings. The Bitterroot Salish came from the West Coast, whereas the Kootenai lived mostly in the interior of present-day Idaho, Montana, and Canada. The Kootenai left artifacts in prehistoric time. One group of the Kootenai in the northeast lived mainly on buffalo hunting. Another group lived on the rivers and lakes of the mountains in the west. When they moved east, they could rely less on salmon fishing, but turned to eating plants and buffalo. During the 18th century, the Salish and the Kootenai tribes shared gathering and hunting grounds. As European-American settlers entered the area, the peoples came into conflict.