Of 66 counties in the Coyote State, 2,784-square-mile Pennington County ranks third by size. Pennington County is in the Black Hills & Badlands South Dakota region. The most common type of land for sale by combined acreage in Pennington County is undeveloped land. Browse all waterfront property for sale in Pennington 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!