Southern Tibet : vol.7 / 774 ページ（カラー画像）

0774	Southern Tibet : vol.7
南チベット : vol.7

west the whole way to the Ding-la Range, the folds proved to have been built up
with a certain regularity. Every new range had to be crossed in a pass just as
the Lunkar Range had been. The rivers were more or less parallel to the Buptsang-
tsangpo, and each flowed to a salt lake just as the Buptsang-tsangpo. Conclusions
could therefore be drawn by analogy, and these conclusions were corroborated by
native information. Therefore it could also be regarded as certain that the passes
of the great water-parting were situated between the several parallel ranges just as
the Samye-la is situated between the Lunkar Range and the Kanchung-gangri. From
the south, along the northern bank of the Upper Tsangpo, it is impossible to spread
any new light on this part of the system. One only sees an endless series of more
or less steep mountain-shoulders and ramifications bordering the valley of the Tsangpo
and at intervals cut through by the moderate or small valleys of the tributaries to
the Tsangpo. One indeed gets the impression that a continuous range runs along
and parallel to the Upper Tsangpo. The drainage area of the Tsa-chu is also unknown,
though it seems probable that most of its feeders come from the surroundings of
passes of the same geomorphological importance as the Samye-la. Only the eastern
feeders of the Tsa-chu take their origin from high snow- and ice-covered crests and
peaks, viz., those of the southern Lunkar Range and those of the northern Lunpo-
gangri.

Another question which will have to be cleared up in the future, is the relation
between the northern Surla Range and the Bongba-yeke-gangri. It is true that I,
on my journey from Poru-tso to Shovo-tso, got the impression of the existence of
two parallel ranges. If there are two, the little Surla River which takes its origin
from the glaciers to the west and south of the Sur-la-Kemi-la, pierces the Bongba-
yeke-gangri in the transverse valley by which its water reaches the Poru-tso. But
on the other hand, the Bongba-yeke-gangri may as well be a part or a ramification
from the main Surla Range, from the northern section of which other ramifications
of the same kind may easily fall to the east.

The next crustal fold is of great interest not only on account of its length,
which is some 760 km. to Yamdok-tso, but also because it presents a means of
connection with the orography of Burrard. From the region west of Tarok-tso it
runs from N.W. to S.E. and gradually turns to the right, i. e., N. N.W.—S. S. E.
under the name of the Lunkar Range. Near Tarok-tso I crossed it in the pass
Lunkar-la, 5570 m. high, and found it here as sharply and well defined as the whole
way along its eastern side, where I had seen it from the valley of the Buptsang-
tsangpo, from Samye-la and from the valley S. E. of it. From 30° North Lat., or
in the region opposite to Samye-la, its stretching becomes N.W.—S. E., and here
are the highest peaks of the range called Lunpo-gangri. From the region where it
is pierced by the Chaktak-tsangpo, and where I have seen it from the east, south

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