Geography of Asia though the Middle East is a division of Asia. The demarcation between Asia and Africa is the isthmus of Suez and the Red Sea. The border with Europe starts with the coast of the eastern Mediterranean, even though Turkey in the Near East extends partly into the Aegean Islands and includes Istanbul on the European side of the Bosphorus. On the north the boundary between the continents of Asia and Europe is commonly regarded as running through the Dardanelles, the Sea of Marmara, the Bosporus, the Black Sea, the Caucasus Mountains, the Caspian Sea, the Ural River to its source,
Geography of Asia first historian whose works are extant, who relies on earlier geography now missing except for fragments. Asia is defined by two akrai, "bluffs" or "shores." One runs from Phasis in Colchis (Georgia) at the eastern end of the Black Sea around the coast of Asia Minor to Phoenicia. The second runs from Phoenicia to the Red Sea (the ancient Red Sea comprised also the Persian Gulf and the Indian Ocean) and from there to India, after which "no man can say what sort of region it is." Asia is equal to its shores, which also define Europe and Libya. The