Lakes in Sully County, South Dakota      Cottonwood Lake Durrstein Lake Fuller Lake Lake Okobojo Mundt Lake Mundt Lake Post Lake Stone Lake Sully Lake Troy Lake Walker Lake Warnes Slough OTHER COUNTIES NEARBY Brule County Buffalo County Dewey County Edmunds County Faulk County Hand County Hughes County Hyde County Jones County Lyman County Potter County Stanley County Walworth County South Dakota Lakes