The Altai Mountains are a mountain range in Central and East Asia, where Russia, China, Mongolia and Kazakhstan converge, and where the rivers Irtysh and Ob have their headwaters. The massif merges with the Sayan Mountains in the northeast, and gradually becomes lower in the southeast, where it merges into the high plateau of the Gobi Desert. It spans from about 45° to 52° N and from about 84° to 99° E.

The region is inhabited by a sparse but ethnically diverse population, including Russians, Kazakhs, Altais and Mongols, though predominantly represented by indigenous ethnic minorities of semi nomadic stock. The local economy is based on bovine, sheep, horse husbandry, hunting, agriculture, forestry, and mining.

The country-wise divisions are as follows. In Russia, the Altai covers three federal areas: the Altai Territory, the Republic of Tyva and the Republic of Altai. In Mongolia, it lies in the BayanUlgi and Hovd provinces. In China, it occupies the Xinjiang Uygur Autonomous Region and in Kazakhstan - the East Kazakhstan Region.

The Altai and Katun Reserves and the Ukok plateaus together form the UNESCO World Heritage Site called The Golden Mountains of Altai.

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