Southern Tibet : vol.3 / 471 ページ（白黒高解像度画像）

0471	Southern Tibet : vol.3
南チベット : vol.3

291

whole lake was still frozen, on May 1. Sometimes there is a narrow strip of level
ground along the shore, covered with gravel.

Camp 152 is at the left side of the next great ravine, Parva, on the top of
the highest terrace, at 4 753 m, and quite 30 m above the surface of the Shuru-tso.
On the road between the two Camps 151 and 152 no living rock is touched; the
detritus in the Sharma ravine consists of sandstone, quartz-porphyry and granite.
Sari-nakdong and Sumdân are small snowy peaks to the east. To the S. 75° E.
are the mountains Parvi-pu, giving rise to the ravine of Parva, the valley of which
seems to come from some black mountains situated further east.

Tsalung is the next ravine descending to the lake, some 60 m broad; as
usual, the erosion terrace at its right side is steep and sharp-cut, some 7 m high,
whereas the left side is rounded; it carries a little brook in a gravelly bed. To-
wards the southern part of the lake, the terraces retreat from the shore; here
it forms not one high terrace but a series of small rounded steps each a few
metres high; they mark the slow desiccation of the lake; Tingring is the last ravine
from the east. Then the road follows the very edge of Shuru-tso, where the ground
first consists of clay and then of soft sand with tussock grass; there are several
pools of fresh water containing algæ.

The eastern mountains retreat and the country is fairly open east of the lake.
Do-tsânkang is the name of a dominating isolated massive, east of our route. From
the south a river enters the southern corner of the Shuru-tso; in its upper part it
is called Tagelung-tsangpo, and near Camp 153 Kyangdom-tsangpo. It has a deep
bed between sharp erosion terraces, and carried about 1 cub. m among great
sheets of ice. Camp 153 is at 4 739 m; the surface of the lake is at about 4 725
m. The southern part of the lake was open.

The situation and form of Shuru-tso is curious and forms an exception from
the general rule in this part of the Transhimalaya. Only the Dangra-yum-tso forms
a similar exception and both these lakes are situated on an almost meridional line,
joined by the broad valley of the lower Targo-tsangpo and the flat plains N.E. of
Shuru-tso. In the northern prolongation of Dangra-yum-tso is the lake Tang-yung-
tsaka. Thus here we may indeed speak of a broad, open meridional valley, some
150 km or 90 miles long from N.N.E. to S.S.W. Here one can travel a very
long distance on perfectly level ground from south to north and vice versa,
which is otherwise impossible within the boundaries of Transhimalaya. The Targo-
gangri is also an exception, being meridional and situated just west of this broad
valley.

The two lakes have, as pointed out above, been in connection with each
other, just as Ngangtse-tso and Marchar-tso, which, however, stretch east and west.
But there is a great difference between Dangra and Shuru. For Dangra is at least
30 or 40 m lower than Shuru, and Dangra is salt, whereas Shuru is fresh. The
Dangra is the last recipient; the Shuru has had an effluent at so late a period that

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