扎曲（藏语：.mw-parser-output .uchen{font-family:"Qomolangma-Dunhuang","Qomolangma-Uchen Sarchen","Qomolangma-Uchen Sarchung","Qomolangma-Uchen Suring","Qomolangma-Uchen Sutung","Qomolangma-Title","Qomolangma-Subtitle","Qomolangma-Woodblock","DDC Uchen","DDC Rinzin",Kailash,"BabelStone Tibetan",Jomolhari,"TCRC Youtso Unicode","Tibetan Machine Uni",Wangdi29,"Noto Sans Tibetan","Microsoft Himalaya"}.mw-parser-output .ume{font-family:"Qomolangma-Betsu","Qomolangma-Chuyig","Qomolangma-Drutsa","Qomolangma-Edict","Qomolangma-Tsumachu","Qomolangma-Tsuring","Qomolangma-Tsutong","TibetanSambhotaYigchung","TibetanTsugRing","TibetanYigchung"}རྫ་ཆུ，威利：rdza chu，“从山岩中流出的河”之意）或称杂曲，湄公河-澜沧江水系的主干流和河源。扎曲源于青海省玉树藏族自治州杂多县。县城以上流域被称为杂曲河源区，其流域总面积10505平方公里，总长度199.3公里。河源区分三段，即加果空桑贡玛曲、扎那曲和扎曲。