The Arikara are a Native American tribe that traditionally lived in the Great Plains region of North America. The term 'Arikara' is derived from the Sioux language and means 'HORNS, ' referring to the tribe's custom of wearing headdresses with HORNS. The Ree, also known as the Arikara, are a federally recognized tribe of Native Americans who live in North and South Dakota. They are closely related to the Mandan and Hidatsa tribes, and their language is part of the Caddoan language family.