The Blue Hole is a marine sinkhole about 100 meters deep, located along the east coast of the Sinai Peninsula, a few kilometers north of Dahab, in the Gulf of Aqaba. This place is of great interest to divers, although due to the almost vertical walls and the great depth, the lower part of the cavity is rarely visited. Another reason of attraction are the walls themselves, from about 30 meters deep, characterized by a very large number of stalactites, some up to 12 meters long. The area is rich in coral and typical reef fauna, such as sharks and groupers.