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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| 0683 |
Southern Tibet : vol.7 |
| 南チベット : vol.7 |
引用情報
OCR読み取り結果
497
I have entered in the list only these two and Dagtse-tso as other lakes belonging
to the same group, as e. g. Lakor-tso, Tongka-tso and Tashi-bhup-tso, are too
little known so far as their drainage areas are concerned. All three of these basins
are large, the third of them, Selling-tso, being the largest in all Tibet, with an area
of 32,775 sq. km.
Finally we come to the southernmost chain of lakes within the self-contained
area of Tibet. In the table I have entered fourteen of them, of which seven were
discovered by NAIN SING, six by me and one, Tengri-nor, has been known for 200 years.
Except one, the Shuru-tso, they are all situated along the northern base of Transhimalaya
in the same way as the Kwen-lun lakes are situated along the southern base of the
Kwen-lun. As nearly every one of the latter are situated in the southern part of
their respective drainage basins, so the Transhimalayan lakes are, as a rule, placed near
the northern edge of their respective basins. One of these lakes, the Tengri-nor,
being 1900 sq. km. in size, is the largest of all lakes in Tibet; the Selling-tso with
1825 sq. km. being the second. Several of the drainage basins are comparatively
large, those of the Tengri-nor and Kyaring-tso having an area of resp. 11,100 and
12,400 sq. km., and those of the Tarok-tso, Teri-nam-tso, and Dangra-yum-tso, being
from 8500 to 10,000 sq. km. in size. Nearly all these lakes, perhaps with the
exception of Marchar-tso, Shuru-tso and Chunit-tso, are fed by more or less considerable
rivers from the great water-parting¹ of the Transhimalaya, a fact which in no small
degree is due to the comparatively abundant precipitation of the south-west monsoon
caught by the Transhimalayan ranges. Still, in this connection it should not be
forgotten that the largest river of the self-contained Tibetan plateau-land does not
take its origin from the Transhimalaya, but from the southern side of the Tang-la,
viz., the Sachu-tsangpo, the drainage area of which is also the largest of Tibet, or
nearly 33,000 sq. km.
The area of the self-contained plateau-land of Tibet, i. e. the region that has
no outflow to the ocean, to the Tarim Basin or Tsaidam, is, according to my
calculation from Colonel H. BYSTROM'S map in 1:1,000,000, in all 717,800 sq. km.,
which is not quite as large as the Scandinavian peninsula (Sweden and Norway
together 772,140 sq. km.).
The whole area of the basins entered in the list given on p. 493, amounts
to 276,050 sq. km., or more than one third of the whole area. To give a list of
all the basins of which the whole Tibetan plateau-land consists and which form a
complicated mosaic work or »puzzle», is of course impossible with our present
knowledge of the country. In my list I have only entered such basins as may
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28
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38
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49
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60
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70
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81
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92
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105
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117
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128
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138
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150
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161
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177
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190
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202
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214
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225
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237
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251
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263
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277
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291
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302
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315
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329
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342
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352
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363
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375
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386
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397
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407
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420
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432
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444
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457
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467
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478
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488
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499
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510
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520
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530
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541
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552
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563
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573
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583
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593
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605
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615
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625
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635
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646
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656
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666
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679
681
683
684
685
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693
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704
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714
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726
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737
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747
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758
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773
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788
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801
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813
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833
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848
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864
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876
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888
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