Southern Tibet : vol.3 / 212 ページ（カラー画像）

0212	Southern Tibet : vol.3
南チベット : vol.3

plain below . . . On the 21st I encamped at Chumikgiakdong, a sheepfold on the
stream which flows to the west of the plain. Leaving my things at Chumikgiak-
dong, I went to Labrang Koja, an encampment distant 9 miles. The river is here
about 250 feet wide and has a very gentle current. It is crossed by boats made
of yak's hides which are sewn at the ends and are attached to sticks at the sides.
Next morning, the 23rd, I started for Loh Mantang,¹ and crossed the Cháchú Sángpo
2 miles above its junction with the Brahmaputra. This stream is about 3 feet in
depth and 60 feet wide, and comes from a snowy ridge about 14 or 16 miles north
of Mantang;² I forded it, and going ³⁄₄ mile farther on arrived at Tadum.³

At the same place I found the breadth of the Tsangpo to be 360 feet and
that of the Tsa-chu 106 feet. As the explorer does not give the depth of the
Tsangpo and says the Tsa-chu is 3 feet deep, his dimensions must be regarded as
very good and reliable, remembering that he travelled in September and I in June.

The map to this article⁴ is very interesting and instructive showing how great
the blanks still were in 1875. The Shang-chu and Ki-chu crossings gave a com-
paratively good idea of the orography of the eastern part of the system, but further
west Montgomerie's map contained necessarily the same errors which had to dis-
appear only in 1907—08, that is to say mountain ranges following close to and
parallel with the northern bank of the Tsangpo, and pierced by the northern trib-
utaries. At two places, however, we find fragments of ranges at some distance
from the river, viz. between 85° and 86° East and at 87¹⁄₂° East. long.

On sheet N:o 71 (Provisional Issue) of India and Adjacent countries published
in January 1904 the same two fragments are still to be seen. On Ryder's map
they have disappeared.

We have followed the journeys and results of the Pundits who, from 1865 to
1875, were sent to southern Tibet by Montgomerie and Trotter and who have con-
tributed to our knowledge of the Transhimalaya. We have seen that the journey
to Tengri-nor by crossing the Nien-chen-tang-la in Khalamba-la and Dam-largen-la
was regarded as specially important as proving the existence of the high range
south of Tengri-nor. But when Nain Sing, two years later saw and took bearings
to a series of peaks on a section of 140 miles of his route the existence of a snowy
range north of the Brahmaputra was regarded as clearly demonstrated. This view
is both right and wrong. The journey of 1871—72 traversed the whole system,
pierced to the very heart of the Transhimalaya and gave two complete profiles
across the system. Thus, in spite of the 85 miles of snowy ranges Nain Sing had
seen north of the Tsangpo in 1866, his journey in the Tsangpo valley was not re-

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