The gaur is the largest extant bovine and is native to South Asia and Southeast Asia. The species is listed as vulnerable on the IUCN Red List since 1986, as the population decline in parts of the species’ range is likely to be well over 70% during the last three generations. Population trends are stable in well-protected areas, and are rebuilding in a few areas which had been neglected.
The gaur is the tallest species of wild cattle. The Malayan gaur is called seladang, and the Burmese gaur is called pyoung.
The domesticated form of the gaur Bos frontalis is called gayal or mithun. Check out http://womennow.in/home-stories-india/animals-of-indian-states-arunachal-pradesh-and-the-gayal/ for more info on it.