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0541	Southern Tibet : vol.4
南チベット : vol.4

NGARI-TSANGPO AND DAMBAK-LA. 325

pass opposite Tashi-gang. The view of the river must be magnificent after hard

rains. Now, in its neighbourhood, it is impossible to get a drop of water; certain

stretches one does not even see the river. Under the bridge its breadth may be

only 5 m. The water is, therefore, much deeper than it is broad. Lower down,

there is a more comfortable passage of the Ngari-tsangfto at a place called Oft,

but its bridge had been destroyed.

On the other side, the ascent is not quite as steep as on the left. But it is

hard work to climb to the top of the next protuberance. In a little valley with

springs and grass , being a tributary to the Ng-ari-tsangpo, we made our Camp

CCCCLXX VIII, Koldoktse. The living rock on this road consisted of oolithic

limestone, phyllitic schist, brownish yellow calcareous sandstone or sandy limestone,

and dark grey phyllitic calcareous schist.

On August 22nd, we made 19.4 km. W. N. W. The first 2 km. to the pass,

Dambak-la, we rise from 4,351 m. to 4,601 m. or 250 m., at a rate of 1:8. On

the next section, from Dambak-la to the bottom of the Saser valley, we sink 279 m.,

or to 4,322 m., being at a rate of 1:5.4. The next section, to the pass Pooche-la,

is 6.2 km. in length. The pass being 4,927 m. high, the rise is here 605 m. or at

a rate of 1 :10.2. The last section is 9.6 km. in length, and here the ground falls

178 m. or to 4,749 m. at Camp CCCCLXXIX, being the more moderate rate of 1 : 54.

From Camp CCCCLXX VIII, the ground continues to rise to Dambak-la,

from which the slope is very steep down to the valley of Saser, directed to the

N. E. and having a brook. The road that follows its left tributary, Tsang-

langma-kesa or simply Kesa, also has a brook and is very steep. The grass is

good. The road soon leaves this valley and goes up steeply between rocky spurs

and hills of the region, Sanek, in a W. N. W. direction to the flat pass, Pooche-la,

with a cairn at a height of 4,927 rn. On its other side the fall down through a

valley between rocks, is gradual. Its relief becomes gradually more and more pro-

nounced. It has a brook, and a wider part of the valley was called Manchu-then.

The road chiefly sticks to the slopes of the hills to the left. A right tributary valley

carries some water. A left tributary was called Sumbu -tar. In the little valley,

Bichutse, we camped near a spring amongst grass. The ground here, everywhere

consisted of gravel and coarse sand. At the right side of the Saser valley, the living

rock was white and grey limestone ; the same rock prevailed at Pooche-la ; in the

valley west of the latter, we found dark grey schist with veins of limestone.

On August 23rd, we made 13.2 km. to the W. S. W. The country was less

accentuated than the day before, but the altitude everywhere, considerable. At the

starting camp, Bichutse, we had 4,749 m., and at the end camp, Lungun, 4,753 m.

On account of the height, the temperature again became low, this night for instance

—1.4°. From the camp the road goes up to a little threshold, 4,861 m. high, from

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