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0247 Southern Tibet : vol.3
南チベット : vol.3
Southern Tibet : vol.3 / 247 ページ(カラー画像)

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doi: 10.20676/00000263
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the ground, they consist of a series of comparatively short ranges overlapping each
other at their extremities. — Though it is impossible to give any definite idea of
the detailed orography of the Himalayas it is possible to divide the mountains into
orographical regions sufficiently distinct from each other, even if their exact
boundaries are somewhat indefinite. The innermost of these is the upland of
Tibet, characterised by great elevation and a dry climate . . . .³ The orographical
region, which in fact is identical with the Transhimalaya, is therefore, according to
Oldham, a very high and dry upland, and hardly anything else could be said of it
in 1893.¹

The name of Trelawny Saunders is intimately associated with the history
of speculative exploration on the Transhimalaya. To give an idea of his position and
views it is sufficient to refer to two different papers of his, published in 1870 and
1877 resp. In the first² he represents on his maps the great peaks »as a culminat-
ing outer range, separated by a chain of elevated valleys from an inner range which
forms the water-parting between the basins of the Ganges and Sanpu-Bramaputra.«
Within this double range of the Himalaya he distinguishes the following parts:
1) The great trough of the Tsangpo, the Satlej and the Indus. 2) The high un-
inhabited plain of Tibet, which is, 3), »succeeded on the east by a part of the high-
land, cut up by vast gorges and narrow ranges, watered by great and rapid rivers,
of which the Sanpu is the most westerly, and the Yalung, an affluent of the Yang-
tse, is the most easterly. In these maps the basin of the Sanpu is made conter-
minous with that of the Yang-tse, but some would carry the three distinct basins
of the Irawaddy, the Salween, and the Mekong or Cambodia rivers up northward
into the narrow space between the Sanpu and the Yang-tse. This is one of the