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0605	Southern Tibet : vol.4
南チベット : vol.4

THE SHÙRU-TSO AND ITS MOUNTAINS. 349

were I I m. too low, the real height would be, not 4,646 m., but 4,657 m. In the

first case the fall would be as 1 : 709 , in the second as I : 863, the latter being

a fall of 51 m. in a distance of 44 km. If we compare this rate of fall with the

relations at some other lakes belonging to the same lacustrine belt as Dangra yum-tso,

we will find that the gradient of slope is different at different lakes. The slope of

the Soma-tsangpo from the point where I crossed it between my Camps CCCC VII

and CCCC VIII and where the height is 4,792 m., down to Teri-n am-tso, which

is at an altitude of 4,679 m., or on a distance of 1 o I km. along the river, the fall is

113 m. or I : 894, a value which indeed comes very near to the one calculated for

Targo-tsangpo. Taking Buptsang-tsangpo from Camp CCCCXX, where the height

is 4,776 m., down to Tarok-tso with 4,627 m. , or 149 m. fall in 48 km. , the rate

becomes as I :322 or nearly three times as steep. Along the Sumdalzg-tsangpo from

Camp CCCCXLI, 4,785 m. high, to Nganglaring-tso 4,746 m., or a fall of 39 m.

in a distance of 27 km., the rate is I : 693. However, the altitude of Dangra yum-tso,

or 4,646 m., is very likely to be correct.

On May Ist, we travelled 18.6 km. S. W. and S. S. W. to Camp CLII, Parva,

on the eastern shore of Shuru-tso. The ground on this section is practically level,

Camp CLI being at 4,758 m., and Camp CLII at 4,753 m. But on the road we

cross the water-parting between the two lakes, being at 4,763 m. only, and so flat

that it is impossible to tell its real situation. A secondary hill slope not far from

the lake had even a height of 4,82o m.

From the last-mentioned place Pan. 179A and B , Tab. 32, was sketched. To

the S. 70° E. the valley of Targo-tsangpo is seen between the mountains. Due south

is the isolated Mount Do-tsänkang- which, therefore, on Pl. 9 has been placed a short

distance too far west. Then from S. S. W. and the whole way to the W. N. W. is

the range west of Shuru-tso with the lake in the foreground. From N. 5° W. to

N. 13° W. are some of the highest peaks of the Targo gangri. Pan. 182A and B,

Tab. 33, is drawn from Camp CLII, Parva, and shows Do-tsänkang S. 2° E. and

then in a very beautiful perspective the mighty range on the western shore of the

Shuru-tso with some of its names, as the Napta valley, Umbu-tang, Umbu, Tang-

mupge, Parms-la and Tarlung, and, of course, the whole surface of the lake in

the foreground.

The altitude of the lake is 4,725 m. Camp CLII being situated on a terrace

along the shore had 4,753 m. The distance to Camp CLIII, Kyangdam, is 12.4 km.

and the altitude at the camp is 4,739 m. From here the Pan. 183A, B and c,

Tab. 33, was drawn. By a curious mistake in the plotting of the panoramas for

reproduction, Targo-gangri appears twice. It should, therefore, be noticed that

Pan. 183A begins from S. 51° W. Then follows to the right a new, more fore-

shortened perspective of the Gangri-do Range on the western shore of the lake.

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