Siouxland is a vernacular region that encompasses the entire Big Sioux River drainage basin in the U.S. states of South Dakota, Minnesota, Nebraska and Iowa. The demonym for a resident of Siouxland is Siouxlander. The lower Big Sioux River drainage basin stretches from Sioux City, Iowa, to Sioux Falls, South Dakota, an area that includes much of northwestern Iowa, the northeast corner of Nebraska, the southeast corner of South Dakota, and the extreme southwest corner of Minnesota.