Details: This poster shows Fort Jefferson in the background, with a clear beach and clear water in the front. At the bottom it says Dry Tortugas Natioanl Park, Fort Jefferson, Florida .
Dry Tortugas National Park preserves Fort Jefferson and the Dry Tortugas section of the Florida Keys. The park covers 101 mi² (262 km²), mostly water, about 68 statute miles (109 km) west of Key West in the Gulf of Mexico. It is famous for abundant sea life, colorful coral reefs and legends of shipwrecks and sunken treasures. The park's centerpiece is Fort Jefferson, a massive but unfinished coastal fortress.