Blue Hole (Red Sea)
The Blue Hole is a diving location on the southeast Sinai, a few kilometres north of Dahab, Egypt on the coast of the Red Sea.
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.