Photo credit:

The Fort Peck Reservation is located in northeastern Montana near Wolfpoint, Montana. This resource rich reservation is home to over 12,000 Assiniboine & Sioux enrolled tribal members and contains about 2,094,000 acres of land within its exterior boundary. There are about 939,165 acres of tribal and allotted surface trust acreage that includes Turtle Mountain Public Domain lands.

http://www.fortpecktribes.org/index.html