Devil's Lake is a lake in the South Range of the Baraboo Range, about two miles south of Baraboo, Wisconsin, in Sauk County, Wisconsin, USA. It has no surface outlets, so by some definitions, it is endorheic; however, it probably drains by underground channels into the Baraboo River. The lake is one of the primary attractions of Devil's Lake State Park. It is also a popular recreation destination for watercraft, fishing, hiking, and climbing.