Southern Tibet : vol.7 / 779 ページ（白黒高解像度画像）

0779	Southern Tibet : vol.7
南チベット : vol.7

and S.W., it again changes its direction and now runs W. N. W. — E. S. E. At
85° 25' East Long. I crossed it at Lamlung-la, 5118 m. high, and a few kilometers
further east in the deep transverse valley of Rong-chu, the upper Sa-chu. The
group of Chomo-uchong belongs to it. Just east of the latter I crossed the range
in Kule-la, 5088 m. high, obviously Ryder's Ku-la to which he gives 5091 m. Thence
it continues nearly straight east, between the Raga-tsangpo and the Tsangpo-Brahma-
putra where it has been crossed by a Pundit in Cha-zang-la, and by Ryder's
expedition in Gang-la. Still farther east the range is pierced by the great river at
Ladse-dsong. East of Ladse-dsong the range runs on the southern side of the Tsangpo.
Eastwards it probably continues much farther than 92° East Long., where it ends
according to Burrard. This question has to be settled in the future. It would not
be easy to say whether the section of the range which is situated to the east of
Ladse-dsong and south of the Tsangpo belongs to Transhimalaya or Himalaya.
I would say to both systems. For if we speak of the original tectonic structure it
certainly is the prolongation of the Lunkar — Lunpo-gangri — Chomo-uchong fold
and therefore belongs to the Transhimalayan system of earth-waves. But if we
attach more importance to the orographical arrangement, it would perhaps be more
correct to say that it is a part of the Himalayan system. In the latter case the
Tsangpo should be regarded as the boundary between the two great mountain systems.
In its eastern section the range may be said to be a bridge joining the Trans-
himalaya with the Himalaya, thus giving a new support to the name Transhimalaya.

We have now finished with the western region of Central Transhimalaya.
The central part, as I have said before, is situated between the two meridional lines
of rift-valleys between fractures and faults, and has been compressed and crumpled
in a most violent way. Beginning in the south we find what I believe is the western-
most section of the Nien-chen-tang-la. It begins S. E. of Samye-la where it is pierced
by the deep-cut valley of Rukyok. Some 20 km. farther east it is pierced by the
upper Chaktak-tsangpo in a deep, wild gorge. Another 24 km. farther east I crossed
it in Gyägong-la, 5490 m. high. W. N. W. of this pass it has some fairly high peaks
which, like the great range farther north, were called Kanchung-gangri by the
Tibetans. Some 78 km. farther east I crossed it in the pass Sao-lungring, 5387 m.
high. Between the two last-mentioned passes at least a part of the range was called
Lombo by my guides, a word that is certainly the same as Lunpo. Still, I have
left it on the map as I heard it. The effluent from Amchok-tso, Dongmo-chu, pierces
the range between rather high, partly snow-covered mountains.¹ Except the Rukyok-
and Chaktak-tsangpo, the Dongmo-chu seems to be the single river piercing the
range in this region.

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