Yarlung Zangbo Grand Canyon in Nyingchi lies near Mount Namjagbarwa where Brahmaputra River turns. It is the longest valley with it length of 496 kilo meters. The valley is home to varieties of species, due to its wide range of sea levels.

It is subtropical climate under 1000 meters’ sea level suitable for diversified tropical indigenous forest. The climate for the height of the valley varying from 1000 to 2400 is mountainous subtropical with abundant rainfall, where rare and endemic coniferous forests can be found on the higher level. The climate for the height of the valley varying from 2400 to 3000 is mountainous temperate type. Coniferous broad-leaved forest wears mixed color, varying from seasons.