Western Siouan languages
The Western Siouan languages, also called Siouan proper or simply Siouan, are a large language family native to North America. They are closely related to the Catawban languages, sometimes called Eastern Siouan, and together with them constitute the Siouan (Siouan–Catawban) language family.
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.