Gyama nyul chu), the Yangtsze (Dre chu), the Mekong (Nya-lung chu), and the Yellow River (Ma chu).
Elevation on the plateau south of the Kuen-lun, and a temperate climate prevailing about the sources of the Dre chu (Yangtsze) in August.
The region under the supervision of the imperial controller includes all the countries north of the upper course of the Dre chu (Yangtsze-kiang).
Leaving Barong Tsaidam, he travelled south by way of the sources of the Yellow river, till he reached the Dre chu (upper Yangtsze-kiang), which he crossed to the north of the important trading centre of Yekundo.
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