<P> The plateau and plains of Northern Asia comprise the West Siberian lowlands; the Angara Shield, with the Taimyr Peninsula, the coastal lowlands, the Putorana Plateau, the Anabar Plateau, the Tunguska Plateau, and the Angara Plateau; and the Lena--Vilyuy Basin . Western Siberia is usually regarded as the Northwest Asia, Kazakhstan also sometimes included there . But Northwest Asia sometimes refers to Caucasus or nearby provinces . </P> <P> The geomorphology of Asia in general is imperfectly known, although the deposits and mountain ranges are well known . </P> <P> To compensate for new sea floor having been created in the Siberian basin, the whole of the Asian Plate has pivoted about a point in the New Siberian Islands, causing compression in the Verkhoyansk mountains, which were formed along the eastern margin of the Angara Shield by tectonic uplift during the Mesozoic Era . There is a southern boundary to this across the northern margin of the Alpine folds of Afghanistan, India, Nepal, and Bhutan, which at the east of Brahmaputra turns to run south towards the Bay of Bengal along the line of the Naga hills and the Arakan Yoma, continues around Indonesia, and follows the edge of the continental shelf along the eastern seaboard of China . The Eurasian Plate and the North American Plate meet across the neck of Alaska, following the line of the Aleutian Trench, rather than meeting at the Bering Straits . </P> <P> Northern Asia is built around the Angara Shield, which lies between the Yenisey River and the Lena River . It developed from fragments of Laurasia, whose rocks were mainly Precambrian crystalline rocks, gneisses, and schists, and Gondwana . These rocks can be found in the Angara Shield, the Inner Mongolian - Korean Shield, the Ordes Shield and the Southeast Asia Shield . The fragments have been subject to orogenesis around their margins, giving a complex of plateaux and mountain ranges . One can find outcrops of these rocks in unfolded sections of the Shields . Their presence has been confirmed below Mesozoic and later sediments . </P>

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