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0565 Southern Tibet : vol.3
Southern Tibet : vol.3 / Page 565 (Color Image)

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doi: 10.20676/00000263
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CHAPTER XXXVII.

NGANGTSE-TSO.

With our present knowledge of the Transhimalaya it is impossible to draw
any absolute and definite boundaries to that system. Nobody would be able to tell
where its last, easternmost ranges sink into mere hills and finally dip beneath the
surface. In the far west it is very likely, though not proved beyond doubt, that
the Transhimalaya belongs to the same system of crustal folds as the southern,
and highest Kara-korum ranges. To the south, the upper Indus from Rupshu, the
Gartang, the Manasarovar, the Gunchu-tso, the Tsangpo, at least to Latse-dsong,
may be regarded as a very natural boundary line. To the north I regard the chain
of great lakes, from Tengri-nor to Nganglaring-tso, as a not less natural boundary
of the Central Transhimalaya, that portion of the system of which I can express an
autoptic opinion, for these lakes are all situated in one great depression or latitudinal
valley, and one can travel from Tengri-nor to Nganglaring-tso without crossing a
single high pass. To the south of this depression is the Central Transhimalaya;
to the north a system of smaller ranges, which, at the present date, is difficult to
define nearer, as I have crossed it only on two lines. It has, however, to be regarded
as situated between the Transhimalaya and the Tibetan Kara-korum, and could, per-
haps, be called the Central Tibetan System. This system no doubt at many places
stretches out apophyses both into the Kara-korum and the Transhimalaya, and is
thus in direct and intimate connection with its two great neighbours. As a rule it
is, of course, impossible and unnecessary to draw absolutely sharp boundary lines
between the different mountain systems of Tibet.
I will now try to give a description of this depression so far as I have had
an opportunity to examine it myself.
My routes in and across the depression begin at Ngangtse-tso, and proceed
westwards to Nganglaring-tso. East of Ngangtse-tso I have only seen Marchar-tso
from a distance. The lakes farther east, as Kyaring-tso, Mokieu-tso, Pul-tso, etc.,
have only been seen by Nain Sing, and are very little known. Tengri-nor or Nam-
tso, at a height of 4 609 m, is the best known, as it has been visited by several