Ket, formerly known as Yenisei Ostyak, is a Siberian language isolate, apparently unrelated to any other language in the world (other than Yugh, a recently-extinct language that was clearly related to Ket). It is spoken by about 2,000 people along the middle Yenisei Basin. Attempts have been made by Soviet scholars to establish a relationship with either Burushaski or the Sino-Tibetan languages.