The Fort Berthold Indian Reservation is located in North Dakota and is home to the Three Affiliated Tribes, which include the Mandan, Hidatsa, and Arikara peoples. Established in 1851, the reservation covers approximately 1,000 square miles along the Missouri River and is known for its rich cultural heritage and history. The reservation's economy is supported by agriculture, tourism, and oil production, particularly due to the nearby Bakken Formation. The tribes work to preserve their traditions while also engaging in modern economic development to improve the quality of life for their members.