Original: The Dry Tortugas are a small group of islands, located at the end of the Florida Keys, USA, about 70 m west of Key West, and 37 m west of the Marquesas Keys, the closest islands.
Simplified: The Dry Tortugas are a small group of islands, located at the end of the Florida Keys, United States. They are located about 113 k west of Key West, and 60 k west of the Marquesas Keys, at, the closest islands.