Fall River County is in Black Hills & Badlands South Dakota. Of the 66 counties in the Mount Rushmore State, 1,749-square-mile Fall River County ranks 12th by size. The most common type of land for sale by combined acreage in Fall River County is residential property. Browse all waterfront property for sale in Fall River 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!