the west by the coast of Sinai and on the east by the island of Tiran. In the middle of this channel are four reefs lying in a northeast-southwest direction that were named after the 19th century English cartographers who drew the first nautical map of this region: JACKSON REEF, WOODHOUSE REEF, THOMAS REEF and GORDON REEF. These reefs divide the straits into two canals, to the east is the so-called GRAFTON PASSAGE, which is used exclusively by ships going northwards, while to the west is the ENTERPRISE PASSAGE for ships heading south.
The strong currents that characterize the Straits of Tiran transport great quantities of plankton and other nutrient material every day, thus supplying a great deal of food to the corals and hence to the reef fish which in turn are eaten by the large pelagic predators such as barracuda, jackfish, tuna and above all sharks which are always in this zone. Consequently, scuba divers in the waters of Tiran are sure to see not only an infinite number of corals but also a wide diversity of exotic fish.