Three Affiliated Tribes of the Fort Berthold Indian Reservation

New Town, ND

Our Tribe

The Mandan, Hidatsa and Arikara Nation, also known as the Three Affiliated Tribes, is located on the Fort Berthold Indian Reservation in central North Dakota. The reservation is located on the Missouri River in McLean,  Mountrail, Dunn, McKenzie, Mercer and Ward counties. 

The reservation consists of 988,000 acres, of which 457,837 acres are owned by Native Americans, either as individual allotments or communally by the tribe. The Fort Berthold Indian Reservation is a U.S. Indian reservation in western North Dakota that is home for the federally recognized Mandan, Hidatsa, and Arikara Nation, also known as the Three Affiliated Tribes.

 The reservation includes lands on both sides of the Missouri River. The tribal headquarters is in New Town, the 18th largest city in North Dakota. Created in 1870, the reservation is a small part of the lands originally reserved to the tribes by the Fort Laramie Treaty of 1851, which allocated nearly 12 million acres in North Dakota, South Dakota, Montana, Nebraska and Wyoming.