Glentana is located in the Northeast corner of Montana, ten miles from the Saskatchewan border. Glentana was a station near the end of the branch line of the Great Northern Railroad that went up to Opheim.To the south of Glentana is the Fort Peck Indian Reservation. Sioux and Assinniboine live on the reservation, encompassing more than 2 million acres of land just east of Fort Peck Lake, almost to North Dakota, and from 50 miles south of Canada to the Missouri River in the south.