Sully County is in Great Lakes South Dakota. Of the 66 counties in the Coyote State, Sully County ranks 29th in terms of size (684,923 acres). The most common type of land for sale by combined acreage in Sully County is undeveloped land. Browse all waterfront property for sale in Sully County on the Land Network to find the marina, lakefront and other recreational property that meets your needs, from waterside land perfect as a retirement investment to existing residential waterfront land and property for hunting, fishing and other outdoor-recreation pursuits!