Blue Hole (Big Pine Key)
The Blue Hole is an attraction on the island of Big Pine Key in the Florida Keys. It is an abandoned rock quarry that was used for nearby road fills and Henry Flagler's Overseas Railroad. The water it contains is mostly fresh and is used by various wildlife in the area, such as birds, snakes, alligators, key deer and green iguanas. It is part of the National Key Deer Refuge.
Blue John Canyon
The canyon is located southwest of the Horseshoe Canyon Unit of the National Park and 42 miles (67 km) south of Green River. It runs for approximately and is a tributary of Horseshoe Canyon, running northeastwards from the Robbers Roost Flats.