The Dhegihan languages are a group of Siouan languages that include Kansa–Osage, Omaha–Ponca, and Quapaw. Their historical region included parts of the Ohio and Mississippi River Valleys, the Great Plains, and southeastern North America. The shared Dhegihan (Degihan) migration history and separation story places them as a united group in the late 1600s near the confluence of the Ohio and Tennessee rivers (southern Illinois and western Kentucky) which then moved westward towards the Missouri river, and separated into different bands. However, some oral traditions and archeological evidence indicate that Dhegihan speaking peoples may have migrated west out of the Ohio River Valley much earlier.