The Yarlung Valley is formed by the Yarlung Tsangpo River and refers especially to the district where it joins with the Chongye River, and broadens out into a large plain about 2 km wide, before they flow north into the Yarlung Tsangpo River or Brahmaputra. It is situated in Nedong County of Lhokha Prefecture (Ch. Shannan Prefecture) in the Tibet Autonomous Region of China. The capital of Lhokha Prefecture, Zêtang, in the Yarlung Valley, is one of Tibet's largest cities, and is 183 km southeast of Lhasa.