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 John Canyon
The canyon is located southwest of the Horseshoe Canyon Unit of the National Park and 42 miles (67 km) south of Green River. It runs for approximately and is a tributary of Horseshoe Canyon, running northeastwards from the Robbers Roost Flats.