Siouan languages
Siouan languages can be grouped into the Western Siouan languages and Catawban languages. The Western Siouan languages can be divided into Missouri River languages (such as Crow and Hidatsa), Mandan, Mississippi River languages (such as Dakotan, Chiwere-Winnebago, and Dhegihan languages), and Ohio Valley Siouan branches. The Catawban languages consist only of Catawban and Woccon.
Ohio Valley Siouan languages
They are called "Ohio Valley Siouan" languages because of a speculative origin along the Ohio River, but only the Tutelo and the Saponi historically dwelled near there; they possibly migrated to the Roanoke River from the region of the Big Sandy River just prior to European contact. The Biloxi and the Ofo lived far to the south, along the Mississippi River.