Of Suakin, in 18° 2' N., as far as Ras Dumeira (12° 42' N.), in the Strait of Bab-el-Mandeb, a coast-line of about 650 m.
East of the Straits of Bab-el-Mandeb, backed by mountains rising to 7000 ft.
An under-current flows out from the Red Sea through the Strait of Bab-el-Mandeb, and from the Mediterranean through the Strait of Gibraltar, raising the salinity as well as the temperature of the part of the ocean outside the gates of the respective seas.
At the end of the reign of Nero, and perhaps even earlier, the king of the Axumites ruled over the Red Sea coast from Suakin to the strait of Bab-el-Mandeb, and traded constantly with Egypt.
19, 42) he says that the Troglodytes brought to Ocelis (Ghella near Bab-el-Mandeb) objects of glass.
Thence the boundary passes in the one direction through the Mediterranean, and down the Red Sea to the southern point of Arabia, at the strait of Bab-el-Mandeb, in 45° E.; and in the other through the Black Sea, and along the range of Caucasus, following approximately 4 0° N.
Both branches meet the coast of Asia almost exactly on the Tropic of Cancer, but the Arabian Sea communicates with the Red Sea and the Persian Gulf by the Straits of Bab-el-Mandeb and Ormuz respectively.
The sea frontier extends from Ras Dumeira on the Straits of Bab-el-Mandeb, a little north of Perim Island, to Ras Gurmarle, a few miles south of the Gulf of Tajura.