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.
Winslow Township, New Jersey
The Blue Hole is a body of water in the middle of woods that is clear blue and always cold, even in the summer, with a very steep shoreline and a maximum depth of approximately , though "Weird NJ" describes the water as "bottomless" and claims that it is a haunt of the Jersey Devil.