Nyingchi also known as Linzhi is a prefecture-level city in southeast of the Tibet Autonomous Region. The administrative seat of Nyingchi is Bayi District. The Chinese claim part of Arunachal Pradesh, which is one of the states of India, as part of the prefecture.
Approximately 90 kilometers west of Gongbo'gyamda County, is the alpine Basum Lake in the upper catchment area of the Ba River, the largest tributary of the Nyang River lying on average about 3,538 metres (11,608 ft) above sea level. The lake surface is on average about 3,538 meters above sea level. Covering an area of 25.9 km2 (10.0 sq mi), the surrounding is populated by a diverse wildlife including leopards, bears, goats, musk deer and Tibetan snow lions.