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Basic Geography
Asia is the central and eastern part of the continent of Eurasia, defined by subtracting the European peninsula from Eurasia. Geologically and geographically, Asia is not a continent or a subcontinent.
The exact boundaries are vaguely defined, especially between Asia and Europe: the demarcation between Asia and Africa is the isthmus of Suez. The boundary between Asia and Europe runs via the Dardanelles, the Sea of Marmara, the Bosphorus, the Black Sea, the ridges of the Caucasus (according to others, through the Kuma-Manych Depression), the Caspian Sea, the Ural River (according to others, the Emba River) and the Ural Mountains to Novaya Zemlya. About 60 percent of the world's population live in Asia.
Asia as a political division consists of the part of Eurasia and nearby islands in the Indian and Pacific Oceans, often excluding Russia.