Southern Tibet : vol.3 / 349 ページ（カラー画像）

0349	Southern Tibet : vol.3
南チベット : vol.3

On the way down to Linga, where the Bup-chu valley is enclosed between
fairly high mountains, the river receives many tributaries. Only from interpolation
and from native reports do I conclude that the joint river from Shib-la and Chesang-la
must join the Bup-chu somewhere below the Sham junction. And still lower down
the joint Sangra-palhé and Sele-nang runs out into the Bup-chu. This river is there-
fore of considerable size, in fact I found later on that it carried the same volume
as the Mü-chu itself and the question is whether the Bup-chu, as being much longer,
should not be regarded as the principal branch. But as the name Mü-chu is used
the whole way down to Raga-tsangpo, the brook from Chang-la-Pod-la must still
be regarded as the source.

From the Sham junction and upwards there is said to be a village of ten
families called Sechen situated in a tributary valley from the left side. Looking
up the valley a great mountain massive called Shakchen is seen; west of it is the
valley Rakchung and west of that mount Mugmu and the small valley Sechung.
The ridge between Bup-chu and Sham is called Dakchung.

A short distance below the Sham junction the Bup-chu receives a tributary
from the left, called Dangbä-chu. Two small valleys entering the widening quite
close are called Niri and Kejak. The road goes up the Dangbä-chu to the S.E.;
it is surrounded by fairly high mountains; Duyung is a left tributary; at Dochen
stone-huts are built. Near the right tributary Chagelung a tight, dark quartzite stands
in solid rock. The gravel in the valley is chiefly porphyry, schist and conglomerate.
From the right side the two valleys Nalung and Dalung enter, and at the point of
their junction are two small villages Lundup and Tamring. Camp 121 is at 4 619 m.

A little above this camp the tributaries Tsubelung and Lalung enter from the
right; another valley from the same side on the way up is Nevo-goma; from the
left enter Nevok, Chialung and Lung, where biotite-granite forms solid rock, —
higher up Yagbe. The mountains round the valley of Dangbä-chu are rather low,
and solid rock is rare; detritus of all sizes fills the bottom and the slopes. The
whole bottom is full of ice. The gravel and ice together make this road anything
but comfortable.

Finally the road leaves the Dangbä-valley which is seen coming from the
south, where it is formed by two smaller valleys, Seuk to the east, and Yak-maru
to the west. The name Dangbä-chu, however, remains with the small right tributary
which comes down from the pass; Larnang is a right tributary to it. The slope up
to the pass is covered with blocks of granite. The pass has a height of 5 250 m and
is situated between two peaks; it is rather flat.

Dangbä-la has so far a higher hydrographical rank than Shib-la and Chesang-
la, as it is a water-parting between the system of the Mü-chu to the north and the Rung-
chu to the south; the latter goes direct to the Tsangpo below the junction with the
Raga-tsangpo. The upper part of the Rung-chu from the pass to Camp 122, Ngartang,
at a height of 4 909 m, receives a series of small tributaries from both sides, the names

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