Nyingchi is a prefecture in the lower reaches of Yarlung Zangbo river. At an average altitude of 3,000 metres above sea level, it is home to Monbas, Lobas and some other ethnic minorities marked for their peculiar habits and custom. Mount Namjagbarwa and the Yarlung Zangbo, 496.9 km long and 5,382 metres in maximum depth and believed to be the world's largest canyon, are the most alluring of all the tourist resources in this prefecture.