The Tarim Basin is an endorheic basin in Northwest China occupying an area of about . Located in China's Xinjiang region, it is sometimes used synonymously to refer to the southern half of the province, or Nanjiang (), as opposed to the northern half of the province known as Dzungaria or Beijiang. Its northern boundary is the Tian Shan mountain range and its southern boundary is the Kunlun Mountains on the edge of the Tibetan Plateau. The Taklamakan Desert dominates much of the basin. The historical Uyghur name for the Tarim Basin is Altishahr (Traditional spelling: ), which means 'six cities' in Uyghur.