It is located at the head of the Gulf of Aqaba in the middle of an atoll. It is the second diving area in Sinai after Ras Muhammad. The castle is 250 m from the Sinai shore, 10 km from the port of Aqaba. Pharaoh's Island has been called by several names, including Coral Island, Gray Island, and the people of Sinai call it three names: "The Castle - Al-Qalaa - Al-Qarya", its area is 325 m from north to south, 60 m from east to west.