He subsequently passed through eastern Tibet to the town of Darchendo, or Tachienlu, on the high road between Lhasa and Peking, and on the borders of China.
The longitude of Darchendo, or Tachienlu, on the extreme east, may be accepted as another obligatory point.
Most of these districts are governed by deba or chiefs, while a few have kings or gyalpo, the most powerful of the latter being the king of Derge, famous for its inlaid metal and leather work, and of Chagla, or, as it is better known, Tachienlu, as it is called by the Chinese or the Dartsemdo of the Tibetans, the headquarters of the tea trade with China.
The great trade routes are, first, that which, starting from Cheng-tu, the capital of the Chinese province of Szechuen, passes by way of Tachienlu or Dartsedo, Litang, Batang, Chiamdo, Larego, Lhasa, Gyantse, Shigatse, reaches the Nepalese Routes, &C. frontier at Nielam and goes thence to Katmandu.
Still another route starts from Tachienlu, and by the valley of the Yalung and the Dze chu runs to Yekundo, and thence to Chiamdo.
The principal trade with China is carried on over the Lhasa-Tachienlu road.
30 31', when he passed into the basin of the Yalung river, traversed the Horba states and finally reached Tachienlu by the Gi la and the valley of the Darchu.
Here the party was stopped by Tibetan authorities and forced to take the tea route through Chinese Tibet (Gyade) by way of Batasumdo, Chebotenchin, Riwoche, Chiamdo to Chiangka, near the upper Yangtse-kiang, whence they proceeded to Tachienlu by Batang and Litang.
Crossing the Sining-Lhasa road a little south of the Dang la range, and about two days' journey north of Nagchuka, Captain Bower crossed the Su chu, and following a course parallel to the Giama-nu chu, he made his way to Riwoche and thence to Chiamdo, from which town he followed the Lhasa-Tachienlu high road to the latter town, which he reached on the 10th of February 1892.
And Rockhill, to Tachienlu in Sze-ch`uen, where she arrived on the 12th of April 1893.