Lhasa River originated in the south of Shan nyainqentanglha Jiali, Phuntsok la Ma ditch. Flow through Nagqu, when hung, Lin Zhou, Mozhugongka, Dazi, Chengguan, Deqing-long heap at Qushui Xian, the middle reaches of the Yarlung Zangbo River is a tributary of the larger total length of 495 km, the basin area of 31,760 square kilometers; the largest flow 2 30 cubic meters /second, the minimum flow of 20 cubic meters /second, in-flow of 287 cubic meters area /s; altitude 5500 meters from the source to the mouth of 3580 meters, the highest in the world is one of the rivers. This river belongs to the type of snow and rain-long, the size of the water as the temperature is high or low precipitation and the number of change .
Lhasa River region for most of the mountain, towering peaks, steep slopes, the terrain tilt from north to south, Mountain Range will have the education and small scale of the modern glaciers, most of the tributaries of the right bank of the river basin originated in glaciers, most of the tributaries originate in the left bank of the lake Or swamp.
Lhasa River in Linzhou County, the ancient Tang Dynasty over valley was "V" type, the following Maizhokunggar County to change the wide valley, 1-1,5 kilometers wide, began to have heart River flood plain, good vegetation on the flood plain, this section of a river Regulation is, the distribution of cross-strait three in a row of terraces: three terraces above the river bit 40-50 , The table for the Department of 50-80 cm thick sand soil, the luxuriant growth of grass, is a good natural pasture; second terrace above the river-meter 20-30; a terrace above the river-meter 10-20 , The majority have been cultivated into arable land.
The two sides along the river valley are alluvial The original, the width of up to 1-10 km, an area of about 57 million mu of cultivated land in these areas, mild climate, flat terrain, thick soil, abundant water is the main grain-producing areas of Tibet.
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