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澜沧江是横断山区重要的河流,是中国最长的南北向河流,全长2354公里,流域面积16.5公里,河谷落差大,约4600米。流域位于北纬21°30′～32°40′,东经94°～101°50′。至南腊河口流出中国国境,出境后称湄公河,在越南胡志明市人南海。澜沧江源于青藏高原,有二源,东源扎曲,西源昂曲,都出自唐古拉山青海省境内的岗果日山,二曲至昌都汇流后称澜沧江。类乌齐河口以上称为上游,山势一般较平缓,河谷平浅。中游为峡谷区,河床坡降大,谷形紧窄。下游两岸山势降低,窄谷
The Lancang River is an important river in the Hengduan Mountains. It is the longest north-south river in China with a total length of 2354 kilometers and a drainage area of 16.5 kilometers. The river valley has a large drop of about 4600 meters. The basin is located at latitude 21 ° 30 ’~ 32 ° 40’ and longitude 94 ° ~ 101 ° 50 ’. To the mouth of the South China River outflow of Chinese territory, after the departure of the Mekong, Ho Chi Minh City in Vietnam Nanhai. The Lancang River originates from the Qinghai-Xizang Plateau. It has two sources: Zhaqu, Dongyuan and Quyuan. Both come from Gangguo Mountain in Qinghai Province in the Tanggula Mountains, and are called the Lancang River after the two rivers merge into Changdu. Above the Wuqi River mouth is called upstream, the mountain is generally flat, shallow valley. The middle reaches of the gorge area, river bed slope down, trough narrow. The lower reaches of both sides of the mountain reduce the narrow valley