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Tavan Tolgoi (, also Tavantolgoi, Tavantolgoy, "Five Hill") is one of the world's largest untapped coking and thermal coal deposits, located in the Ömnögovi Province in southern Mongolia. It has a total estimated resource of 6.4 billion tonnes, one quarter of which is high quality coking coal. It is divided into six sections: Tsankhi, Ukhaa Khudag, Bor tolgoi, Borteeg, and Southwest and Eastern coalfields. The Tsankhi section is the largest part, and is divided into East and West Tsankhi - these have had the most focus recently.