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0485	Southern Tibet : vol.3
南チベット : vol.3

297

My road then follows the Raga-tsangpo for two days. The valley rises slowly
to the W.S.W. At first it is rather narrow, but soon becomes half a kilometre broad,
and halfway it opens out to a breadth of 3 to 5 km, and is more like a plain.
The ground is hard and even, partly covered with gravel, partly with low close
grass, which sometimes forms a real steppe. As a rule, the river keeps to the right
or southern side of the valley; it is open the whole way; only in the more protected
and shadowy side valleys is there still ice. At Camp 160, the Raga-tsangpo carried
5¹⁄₂ cub. m a second; the current is quick, but seldom forms rapids in this part of
its course.

On the left or northern side of the valley the mountains are higher than on
the right. They are wild, steep, rugged and rocky, pierced by short, narrow valleys,
and here and there covered with patches of snow, but between the valley and them
there is a confusion of low, yellow, rounded hills, for some 10 km. The southern moun-
tains are, as far as can be seen from our road, of respectable, but no great height, and
nowhere covered with snow. The river sweeps along their foot and does not leave
room for any marked erosion terrace, as on the left or northern bank. In the open-
ings of the side valleys, however, one sees some more noticeable massives, one of
which is called Marpo, another Rinak, or, according to other informants, Ngangba-
kanja. Through the Ngangba valley one sees 10 or 12 km south a short ridge,
stretching east and west.

From east to west we notice several tributary valleys; from the north: Kyak-
chung, Töchung, Racho, Tökya; beyond a small isolated rock is Tibuk; the rock is
here grey sandstone, forming small thresholds hardly rising above the ground; to the
west a hill gives a beautiful view over the whole valley with the great mountain group of
Chomo-uchong in the background; Shalung is a small valley with 15 m high erosion
terraces; Pendem is larger; both these join the Teeng-chu before entering the Raga-
tsangpo; Salung is a small valley issuing from between low hills; Parva is the
next, quite full of ice in its mouth; finally Yalung and Lungchung. From the right
side, i. e., from the southern mountain range which is situated between Raga-
tsangpo and Tsangpo, we have Tipkuk; Shärlung and Sukshin, which join before
leaving the mountains; Damlung, Naga and Ngangba, the latter comparatively large,
whereas the Tograng is short and steep. Of course, none of these valleys can come
from any far distance, as there is no space between the two great rivers. But even
the northern tributaries are very short and, as far as can be seen, none of them
has been able to pierce the range which I take to be the western prolongation
of the Nien-chen-tang-la. The Dongmo-chu from Amchok-tso is the single one
which pierces the range. We have seen that the Mü-chu-tsangpo also pierces it
further east. But whether there is any other tributary, between Dongmo and Mü-
chu which breaks through the range cannot be ascertained from what we know at
present. A party from Ryder's and Rawling's expedition followed the Raga-tsangpo

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国立情報学研究所 - ディジタル・シルクロード・プロジェクト 『東洋文庫所蔵』貴重書デジタルアーカイブ

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国立情報学研究所 - ディジタル・シルクロード・プロジェクト
『東洋文庫所蔵』貴重書デジタルアーカイブ