The Kuznetsk Basin (Russian: Кузнецкий угольный бассейн, Кузбасс; often abbreviated as Kuzbass or Kuzbas) in southwestern Siberia, Russia, is one of the largest coal mining areas in Russia, covering an area of around 10,000 square miles (26,000 km2). It lies in the Kuznetsk Depression between Tomsk and Novokuznetsk in the basin of the Tom River. From the south it borders the Abakan Range, from the west Salair Ridge, and Kuznetsk Alatau from the east.
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It possesses some of the most extensive coal deposits anywhere in the world; coal-bearing seams extend over an area of 10,309 square miles (26,700 km2) and reach to a depth of 5,905 feet (1,800 m). Overall coal deposits are estimated at 725 billion tonnes. The region's other industries, such as machine construction, chemicals and metallurgy, are based on coal mining.