Crystal Lake is a lake in Burnsville, Dakota County, Minnesota. The lake is a primary source of recreation for the city of Burnsville and the surrounding area. Crystal Beach Park , Crystal Lake West Park and Tyacke Park all have coastline along the lake and offer amenities such as boat landings, picnic areas, hard surfaced courts, playground equipment, walking trails, and others. Nearby Lac Lavon Lake Park has a softball complex, tennis courts, and horseshoe courts. The Lake also contains two islands, Picnic Island (nicknamed Potty Island) and Maple Island. The most southerly parts of the lake extend into the city of Lakeville.