Southern Tibet : vol.3 / 369 ページ（カラー画像）

0369	Southern Tibet : vol.3
南チベット : vol.3

269

The name Raga-tsangpo is hardly known at Lingö; the joint river, as well as the
western river, are both called Dok-chu. Generally the natives have very diffuse
ideas about the origin of the rivers. Asking where the sources of the Mü-chu are
situated, one gets the answer: in the Chang-targo mountains, which means: in the
Targo-gangri of the north.

Remembering the orography of the first crossing, where Dangbä-la is situated
in a range which for good reasons I regard as the western continuation of the Nien-
chen-tang-la, and thus on the water-parting between Bup-chu-Mü-chu and Rong-chu,
one could not expect to find any considerable tributaries to the Mü-chu from the
east, until many days' journey northwards. Such is also the case; the main valley
is very sharp cut, the tributaries insignificant. The Mü-chu valley is narrower than
that of the Dok-chu, as the Mü-chu is a transverse valley, piercing ranges, whereas
the Dok-chu is situated between and parallel with two ranges.

In the lowest part of its course the Mü-chu keeps to the right or western side
of its valley; at its left side heaps of big granite blocks are spread at the foot of
the rocks; only just before joining the Dok-chu the river crosses its valley diagon-
ally to the left side and flows along and amongst the blocks. So far as the Dok-
chu or Raga can be seen westwards it also keeps to the right side of its valley.
The two last southern tributaries to the Dok-chu are Pangyu and Dachü, and the
last northern is Sangi.

In the Mü-chu small rapids alternate with deep, broad and quiet sections,
and the general fall is slow. Sometimes the road keeps some 10 or 20 m above
the bottom of the valley, sometimes on the top of the left side terrace. Chisu is
a valley from the east, Ok-tsangma a part of the main valley with barley fields pro-
tected by a stone wall; Kao-chirang is a valley from the west, as usual, short and
steep; Pukpe-taglung is a grotto at the left side of the valley, Kabu a wide but
short valley from the west, with a brook. The valley of the Mü-chu is here very
regular; it sometimes looks almost like an artificial channel. The breadth is about
35 m. An iron chain bridge, called Tokcha or Ducha, crosses the river here. Narrow
belts of ice follow both banks at one metre above the present level of the river,
indicating a considerable fall of the water. At the right side of the valley, below
the mouth of the Kabu, the erosion terrace has a height of some 30 m. From the
east enters the valley Taka. Grey granite prevails the whole way, sometimes inter-
rupted by diabas-porphyrite or schist.

At Tagmara and higher up the river has mighty terraces on both sides. The
valley is deep cut and well worked out by the river. The mountain masses east
and west are of the same moderate height, but compact and solid. Ege-tang is a
ridge of quartzitic schist, above which the granite crops out again.

Finally Changulung enters from the west and Tongdung-pu from the east; in
the mouth of the latter there is a juniper of unusual dimensions. From N. 30° E.
enters the valley Tongchen-pu. Tong is the name of the whole region round Camp

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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