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| 0686 |
Southern Tibet : vol.7 |
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and others in the next depression to the south, have a mean altitude of 4956 m.
Calculating from 9 lakes of the central plateau-land the altitude of which is known,
we get a mean altitude of 4938 m.
The next line of lakes is interesting. In my list I have entered only Panggong-tso,
Dagtse-tso and Selling-tso. Adding seven other lakes, not entered in the list we
get the following series:
Panggong-tso . . . . . 4317 m. Dshuvu-tsagga . . . . 4572 m.
Dshölu-chuga . . . . . 4392 » Lakkor-tso . . . . . . 4600 »
Tsolla-ring-tso . . . . . 4440 » Tongka-tso . . . . . . 4500 »
Jim-tso . . . . . . . . . 4495 » Dagtse-tso . . . . . . 4544 »
Oman-tso . . . . . . . 4507 » Selling-tso . . . . . . 4611 »
The mean altitude of these lakes is only 4498 m.! And as a rule the absolute
altitude gradually increases from west to east, which, on this line at least, contradicts
the previous conclusion that the western lakes should be higher than the eastern.
Considering finally the 10 Transhimalayan lakes of the list, we find that their
mean altitude amounts to 4738 m. We have therefore a depression, Panggong-tso—
Selling-tso, in the interior of Tibet that is no less than 440 m. lower than the average
height of the depressions north of it and 240 m. lower than the depression of the
Transhimalayan lakes. To this curious folding-trough as well as to the other de-
pressions we shall return in a subsequent chapter.
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788
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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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