Eurasia comprises the whole of the northern part of the European and Asiatic land-mass, from Portugal to the Bering Strait. Oceania comprises the Americas, the Atlantic islands including the British Isles, Australasia, and the southern portion of Africa. Eastasia, smaller than the others and with a less definite western frontier, comprises China and the countries to the south of it, the Japanese islands and a large but fluctuating portion of Manchuria, Mongolia, and Tibet.
