The Kuznetsk Basin (often abbreviated as Kuzbass or Kuzbas, Russian: Кузнецкий бассейн, Кузбасс) in southwestern Siberia, Russia, is one of the largest coal mining areas in the world, covering an area of around 27,000 square miles (70,000 km²). It lies in the Kuznetsk Depression between Tomsk and Novokuznetsk in the basin of the Tom River.