Ballast Key

Ballast Key is an island in the Florida Keys in Monroe County, Florida, United States. It is the southernmost point of land in the contiguous United States. It was the last privately owned land within the boundaries of the Key West National Wildlife Refuge.Located in the Outlying Islands of the Florida Keys, it is one of the Mule Keys that are nine miles west of Key West. The island's 26 acres were donated by Key West developer David W.