The Yarlung Valley is formed by Yarlung Chu, a tributary of the Tsangpo River in the Shannan Prefecture in the Tibet region of China. It refers especially to the district where Yarlung Chu joins with the Chongye River, and broadens out into a large plain about 2 km wide, before it flows into the Tsangpo River. It is situated in Nedong District of the Shannan Prefecture and includes the capital of the prefecture, Tsetang, one of Tibet's largest cities, 183 km southeast of Lhasa.

Shannan, also known as Lhoka, is a prefecture in the southeastern Tibet Autonomous Region, China. Shannan includes Gonggar County within its jurisdiction with Gongkar Chö Monastery, Gonggar Dzong, and Gonggar Airport all located near Gonggar town.