Asia is the world’s largest and most populated continent. Since the 1700s, the border between Europe and Asia generally considered to go through the Ural Mountains, Ural River, Caspian Sea, Caucasus, Black Sea, Bosporus, the Sea of Marmara and the Dardanelles. The border between Asia and Africa is normally considered to be the Suez Isthmus and the Red Sea. About 60% of the world’s population lives in Asia, of which only about 2% live in the north and the innermost part, ie, Siberia, Mongolia, Kazakhstan, Xinjiang, Tibet, Qinghai, western Uzbekistan and Turkmenistan.