The region under the supervision of the imperial controller includes all the countries north of the upper course of the Dre chu (Yangtsze-kiang).
From this point the traveller followed a general south-westerly direction around the heads of all the feeders of the upper Dre chu, and thence into the lake region of northern central Tibet, crossing Bonvalot's route south of the Chi-chang t'so and that of Bower a few days farther south.
Thence, after crossing the upper Yalung, which flows by the town of Kanze, she pursued her journey to the upper course of the Yangtse-kiang (Dre chu), crossing that river somewhere near where A.-K.
Here they were finally stopped by the Tibetans, and after a delay of six weeks passed in vain attempts to obtain permission to go to Lhasa, they were only allowed to proceed to Nagchuka on the Sining-Lhasa road, and to continue by the Gyade route to Yekundo, near the upper Dre chu, and thence to Sining in Kansuh.
In the spring of 1901 the expedition resumed its march eastwards around the Dre chu and the Ja chu (Yalung river), followed up the left bank of the latter and got back to Russian Lelu (Oring t'so) on the 30th of May 1901.