sayan mountains

The Sayan Mountains are a mountain range of Asia, forming the eastern continuation of the Sailughem or Altai range, stretching from 89 E. to 106 E. Orographically they are the N border-ridge of the plateau of NW Mongolia, and separate that region from Siberia. The geology is imperfectly known. While the general elevation is 7000 to 9000 ft., the individual peaks, consisting largely of granites and metamorphic slates, reach altitudes of 10,000 feet and 11,450 feet, e.g. in Munko Sardyk; while the principal passes lie 6000 to 7500 feet above the sea, e.g. Muztagh 7480 feet, Mongol 6500 feet, Tenghyz 7480 feet and Obo-sarym 6100 feet. In 92°E the system is pierced by the Bel-kem or upper Yenisei, and in 106°, at its eastern extremity, it terminates above the depression of the Selenga-Orkhon valley. From the Mongolian plateau the ascent is on the whole gentle, but from the plains of Siberia it is much steeper, despite the fact that the range is masked by a broad belt of subsidiary ranges of an Alpine character, e.g. the Usinsk, Oya, Tunka, Kitoi and Byelaya ranges. Between the breach of the Yenisei and the Kosso-gol (lake) in. 100 30' E. the system bears also the name of Yerghik-taiga. The flora is on the whole poor, although the higher regions carry good forests of larch, pine, juniper, birch, and alder, with rhododendrons and species of Berberis and Ribes. Lichens and mosses clothe many of the boulders that are scattered over the upper slopes. See also: Abakan River

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