The main stream of this last is called Dichu in Tibet, and its chief feeder is the Ya-lung-kiang, which rises not far from the Hwang-ho, and is considered the territorial boundary between China and Tibet.
The summit of the great mountain mass is occupied by Tibet, a country known by its inhabitants under the name of Bod or Bodyul.
The mean elevation of Tibet may be taken as 15,000 ft.
Professor Takakusu has shown the possibility of several complete books belonging to it being still extant in Chinese translations,' and we may yet hope to recover original fragments in central Asia, Tibet, or Nepal.
Kang-hi next ordered a similar map to be made of Tibet, the survey being executed by two lamas who were carefully trained as surveyors by the Jesuits at Peking.