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 Whale Harbour
Blue Whale Harbour () is a small, sheltered anchorage entered west-southwest of Cape Constance, along the north coast of South Georgia Island. It was charted in 1930 by Discovery Investigations personnel. It is named for the blue whale, a commercially important species which was once widely distributed in polar and subpolar waters; numbers are now very small.