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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| 0335 |
Southern Tibet : vol.3 |
| 南チベット : vol.3 |
引用情報
OCR読み取り結果
CHAPTER XXIX.
THE FIRST CROSSING.
In the preceding chapters I have tried to collect all that was known of the
Transhimalaya in 1906. I have not dared to discuss the western and eastern con-
tinuation of the system beyond the frontiers of Tibet, as the material we possess is
insufficient for any reliable conclusions, and under such conditions I regard it wiser
to leave this problem to a future occasion. It only remains to me to give a general
idea of my own results, and to begin with I have decided to describe every one
of my eight crossings separately. I begin in the east and proceed westwards, dis-
regarding the chronological order. After having described every separate transverse
profile across the Transhimalaya, I will give a general résumé of the whole central
part of the system so far as it is known at the present moment. Comparing my
results with the contents in the preceding historical chapters, the reader will be able
to understand in how far I have contributed to our knowledge of the central parts
of this gigantic and most interesting mountain system.
The first crossing begins from Camp 108 on the Ngangtse-tso and ends a
little beyond Camp 125 on the Tsangpo. The distance as the crow flies, is 216,6
kilometres, or 260 kilometres on my route. The height of the starting point on
the lake is 4 694 m, the height beyond Camp 125, on the river, is 3 930 m.
The culmination point of the system on this line is Sela-la with 5 506 m, which
means a rise of 812 m from the lake to the highest point of the system, and
a fall of 1 576 m from the same point to the Tsangpo. The distance from the
Ngangtse-tso to Sela-la is 92,3 km, from Sela-la to the Tsangpo 127 km. There-
fore the front-fall of the system towards the valley of the Tsangpo is much steeper
than the back-fall towards the northern plateau land or Chang-tang. This fact will
be more and more accentuated from west to east, so far as the Chang-tang, with-
out outflow to the sea, stretches for beyond that limit the whole Tibetan mountain
land begins to fall eastwards, in Kham and Szechuan. Westward, on the other
hand, at the uppermost Tsangpo, there will be no difference at all between the
plateau land and the Tsangpo, nay, we shall even find places where some of the
lakes at the northern foot of the Transhimalaya will be found at a lower level than
the corresponding parts of the valley of the Tsangpo. Or, in other words, the
Tsangpo works its course deeper and deeper into the crust of the earth, whereas
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563
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587
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599
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