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the last seven in a long string of coral islands (keys) and sandbars that extend westward from Key West (Monroe county), at the tip of southern Florida, U.S., into the Gulf of Mexico. The islands-Bush, East, Garden, Hospital, Loggerhead, Long, and Middle keys-and the unfinished Fort Jefferson (1846-76) on Garden Key were proclaimed Fort Jefferson National Monument in 1935 and became established as Dry Tortugas National Park in 1992. The park, which is within the Florida Keys National Marine Sanctuary, has a land and water area of 101 square miles (262 square km).