—or simply West Asia
—is the westernmost subregion of Asia. It includes Anatolia, the Arabian Peninsula, Iran, Mesopotamia, the Levant region, the island of Cyprus, the Sinai Peninsula, and Transcaucasia (partly). The region is considered to be separated from Africa by the Isthmus of Suez in Egypt, and separated from Europe by the waterways of the Turkish Straits and the watershed of the Greater Caucasus. Central Asia lies to its northeast, while South Asia lies to its east. Eight seas surround the region (clockwise): the Aegean Sea, the Black Sea, the Caspian Sea, the Persian Gulf, the Arabian Sea, the Gulf of Aden, the Red Sea, and the Mediterranean Sea.