(from the article `Denakil Plain`) ...Rift Valley and the Awash River. Live volcanoes (often called the Denakil Alps) separate it from the Red Sea. Any water that comes into the plain ... ...into a coastal plain. North of the Gulf of Zula, the plain is only 10 to 50 miles wide, but to the south it widens to include the Denakil Plain. .....