Wisconsin Dells or Kilbourn City is a city in south-central Wisconsin, with a population of 2,678 people as of the 2010 census. It is surrounded by four counties: Adams, Columbia, Juneau, and Sauk. The city takes its name from the dells of the Wisconsin River, a scenic, glacially formed gorge that features striking sandstone formations along the banks of the Wisconsin River. Together with nearby Lake Delton, the city forms an area known as "the Dells", a popular Midwestern tourist destination. The Dells area has an estimated five million annual visitors.