Of 67 counties in the Sunshine State, 2 million-acre Monroe County ranks first by size. Monroe County is in the Southeast & The Keys Florida region. Browse all waterfront property for sale in Monroe 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! The most common type of land for sale by combined acreage in Monroe County is house.