Peter Alexeivitch Kropotkin,
1911 Encyclopædia Britannica
(1911)
“ The conception of north-west Mongolia as a region filled with mountain ranges radiating from the Altai must thus be abandoned. It is a massive swelling of the earth's crust, representing the northern counterpart of the plateau of Tibet. This massive swelling is cut into, between the Ektagh Altai and the eastern Tʽien-shan, by the relative depression of Tarbagatai and Dzungaria, 1500 to 3000 ft. in altitude; while to the south of the eastern Tʽien-shan comes the Tarim depression, from 2200 to 3000 ft. high, and occupying an area of about 88,000 sq. ”
