Siouxland

Siouxland is the name for the drainage basin of the Big Sioux River. (Sioux is pronounced like Sue). The people in the area think they have a common history, even though the territory today is part of several U.S. states. They also feel like belonging together in other ways. The author Frederick Manfred first used the term Siouxland, in 1946. 
Important cities in the area include Sioux Falls, South Dakota, Sioux City, Iowa and Norfolk, Nebraska.