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0503	Southern Tibet : vol.7
南チベット : vol.7

0503

Southern Tibet : vol.7

南チベット : vol.7

Lan-tsan-tsian or the Tibetan Lakio. It turns to the south and has, lower down,
the name of Mekong.

In that part of the range Tan-la itself which Prshevalskiy saw, the snow peaks
were approximately estimated at 19—20,000 feet at least. Living rock was very
rare, and in some places altogether missing. On both sides of the Tang-la, sand
and argillaceous schists were found. On the northern side the glaciers go down
almost to the height of the pass, and the snow-line seems to be at about 17,000
feet. On the southern side he estimates the snow and ice-line at 500 feet higher.
The climate is extremely severe, and worse than the surrounding regions of Northern
Tibet. Storms are general the whole year round. The cold in the winter is extreme,
During the summer rain, snow and hail are constantly falling. At sunrise in the
beginning of November, Prshevalskiy observed —30.0°, and in the middle of December
—31.5°. Grass appears on the Tang-la to 16,000 feet. Above that height the ground
consists of very extensive marshes with tussocks. Such fill also the whole southern
slope. On the latter, hot mineral sources are to be found.

During 8 days Prshevalskiy ascended the northern slope of Tang-la. The ani-
mals were very weak on account of the considerable height. One had to follow a
path, which, as a rule, was covered with ice. Sand or gravel had to be spread on
it for the camels. The rareness of grass, the bitter cold at night and the very hard
winds made the journey still more difficult. As an average, only 15 versts were covered
every day. The 8th day's march took the caravan to the pass of Tang-la. To the right
and left of the pass mighty mountains rise approximately to 2,000 or 3,000 feet
above the pass or to about 19—20,000 feet high. Mighty glaciers, especially to
the west of the camp, filled the gorges and parts of the northern slopes, continuing
on them nearly to the horizontal ground. The distance from the camp to the nearest
of these glaciers was only one verst. On the northern slopes some very poor grass
was to be found, even up to the pass itself, the southern slope was covered with
fine gravel of argillaceous schist, and living rock was not to be seen. The pass
itself is so easy that it can hardly be noticed. The height was 16,700 feet. From
the pass to the river San-chu at the southern side, the caravan needed 5 days. Here
the height was 14,700 feet. The river just mentioned falls into the Tan-chu, or, in
Mongol, Bugin-gol, which goes to Nap-chu or Khara-usu.

On a very good map in Petermann's Mitteilungen, 1883,¹ the »Tan-la Ge-
birge» is represented as stretching W. N. W.—E. S. E. at 33° N. lat. The route of
Prshevalskiy crossed this range at 92° 20' E. long. from Greenw.²

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

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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