The Gulf of Suez (Arabic: خليج السويس, translit. khalīǧ as-suwais; formerly بحر القلزم, baḥar al-qulzum, lit. "Sea of Calm") is a gulf at the northern end of the Red Sea, to the west of the Sinai Peninsula. Situated to the east of the Sinai Peninsula is the smaller Gulf of Aqaba. The gulf was formed within a relatively young but now inactive Gulf of Suez Rift rift basin, dating back about 26 million years. It stretches some 300 kilometres (190 mi) north by northwest, terminating at the Egyptian city of Suez and the entrance to the Suez Canal. Along the mid-line of the gulf is the boundary between Africa and Asia. The entrance of the gulf lies atop the mature Gemsa oil and gas field.
The length of the gulf, from its mouth at the Strait of Gubal (alternate name: Strait of Jubal) to its head at the city of Suez, is 195 miles (314 km), and it varies in width from 12 to 20 miles (19 to 32 km).
The International Hydrographic Organization defines the southern limit of the gulf as "A line running from Ras Muhammed (27°43'N) to the South point of Shadwan Island (34°02'E) and thence Westward on a parallel (27°27'N) to the coast of Africa".
The gulf sedimentary basin stratigraphic section consists of prerift Paleozoic to Oligocene clastic rocks and carbonates, and synrift and postrift Miocene to Holocene clastics and evaporites.:236 Three large oil fields are in the gulf: the El Morgan discovered in 1964, Belayim discovered in 1955, and the October Field discovered in 1977.:238 The October Field produces from the Cretaceous Nubia Formation, the Upper Cretaceous Nezzazat Formation, the Miocene Nukhul Formation, and the Miocene Asl Member of the Upper Rudeis Formation.:236
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