Tibet, in its largest limits, is a table land, the highest plains of which have a mean elevation of 11,510 feet, or about 1,300 feet lower than the plateau of Bolivia, near Lake Titicaca. The snow-line on the north side of the Himalaya is at an altitude of 16,630 feet; on the southern slope it is at 12,982 feet. Several striking analogies may be traced between this country and Peru: the tripartite divisions caused by lofty ranges; their common staples of wool, from alpacas and vicunas in one, and sheep and goats in the other; the abundance of precious metals, and many specific customs. The entire province of Tibet is divided by mountain chains into three distinct parts; its western portion consists of the basin of the Indus, until it breaks through into Cashmere at Makpon-i-Shagaron. It begins near Mount Kailasa, and stretches northwest between the Hindu Kush and Himalaya, comprising the whole of Beltistan and Ladak; the Kara-korum, Mus-tag, or Tsung ling range defines it on the northeast. The second part consists of an extensive desert land, commencing at Mount Kailasa, and having the Tsung ling on the west, the Kwănlun on the north (which separates it from Khoten, and the high watershed of the Yangtsz’, Salween, and other rivers), and Lake Tengkiri, on the east; the Himalaya constitutes its southern boundary. This high region, called Katshe or Kor-kache, has not been traversed by intelligent travellers and is one of the few yet unknown regions of the earth, and is nearly uninhabitable, owing to the extreme rigor of its climate.[135] The eastern part, consisting of the basin of the Yaru-tsangbu, contains, in its plains, most of the towns in Tibet, until it reaches the Alpine region which lies between the River Yaru and the Yangtsz’, a space extending from long. 95° to 99° E. This district is described as a succession of ridges and gorges, over which the road takes the traveller on narrow and steep paths, crossing the valleys by ropes and bridges enveloped in the clouds. Mount Kailasa, a notable peak lying in the northeastern part of Nari, is not far from 26,000 feet high. The number of summits covered with perpetual snow exceeds that of any other part of the world of the same extent. The road from Sz’chuen to H’lassa strikes the Yalung kiang, in the district of Ta tsien lu, and then goes southwesterly to Batang on the Yangtsz’ kiang; crossing the river it proceeds up the narrow valley a short distance, and then crosses the mountains northwest to the Lantsan kiang or River Meikon, by a series of pathways leading over the gorges, till it reaches Tsiamdo; from this point the road turns gradually southwest, following the valleys when practicable, till it ends at H’lassa.