LRichard's ..Comprehensive geography of the Chinese empire and dependencies ..translated into English, revised and enlarged . g, while during the greatest heat, in June, the average 542 BOOK II. OUTER DEPENDENCIES. recorded at 1 p. m. is 71° F. The Central region of the lakes has also a very dryclimate in Autumn, in Winter and in Spring, but in Summer rain falls the S., the country is deluged with rain, hail or snow, the whole year round. In theN., there are extremes of heat and cold in Summer and Winter. In March, the snowlies still very deep in the Tsaidam passes. — The large w
LRichard's ..Comprehensive geography of the Chinese empire and dependencies ..translated into English, revised and enlarged . g, while during the greatest heat, in June, the average 542 BOOK II. OUTER DEPENDENCIES. recorded at 1 p. m. is 71° F. The Central region of the lakes has also a very dryclimate in Autumn, in Winter and in Spring, but in Summer rain falls the S., the country is deluged with rain, hail or snow, the whole year round. In theN., there are extremes of heat and cold in Summer and Winter. In March, the snowlies still very deep in the Tsaidam passes. — The large watercourses are never frozenover, but the minor streams are covered in Winter with a thin layer of ice. The climate of Tibet, though rigorous, is nevertheless healthy. The dangerarises from the variations, which are considerable. Hydrography. — The mountain-system of Tibet shapesits watercourses. Upon the vast table-lands of the N., Centre, nothing but lakes are found, and not a single im-portant river. In the Eastern and Southern regions, the country-has numerous torrents and rivers, and also a few SKETCH-MAP OF SOUTHERN TIBET. CHAPTER IV. TIBET. 543 The principal lakes of the table-lands are the Iki-Namurand the Pang-kung, both in the N. W. The latter is especiallyimportant, and very large. It lies at an elevation of 14,000feet above sea-level. The Dangra^ Zilling-tso and Tengri-Nor, all of much vasterextent, are situated in the Central region. The Ten/gri-Nor liesat an elevation of 15,190 feet. It is 50 miles long, from 15 to20 miles wide, and has an area of about 700 square miles. The greater number of these lakes are salt or brackish.•As the water escapes with difficulty throughout all thisregion, the soil is entirely saturated with it, and frozen overduring 8 months of the year, while it is muddy and almost aquagmire in Summer. The few and meagre rivers which risethere, flow into the lakes, and even these seem to diminishconstantly both in volume a
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