宗曲又名拉达河、西曲河、雪曲河,位于中国西藏自治区东北部的一条河流,是长江上游金沙江右岸支流。上游称娘那曲,发源于贡觉县拉妥乡拉多牛场西北的沼泽地带,向南流约10千米进入芒康县境,东南流至珠达转西南流,经宗西乡后折向南流,至多岗再次折向东南流,右纳错龙门曲后折向东北,过日荣后转向东,最后于朱巴龙乡以南汇入金沙江。河长124千米,流域面积3080平方千米,[1]年均流量32立方米每秒。自然落差2038米。水能理论蕴藏量30万千瓦[2]。
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