清涧河,位于中华人民共和国陕西省北部的一条河流,为黄河右岸支流,源流称中山川,[注 1]发源于延安市安塞区东北坪桥镇党渠村安保塌以西白猪山北麓,向北流注入阳咀水库,出库后向东南流,注入子长市中山川水库,出库后向东流,于安定镇张家岔村以南左纳唐川河后又称秀延河,干流继续向东流经安定镇、子长市区瓦窑堡街道、杨家园则镇、马家砭镇,进入清涧县后转东南流,始称“清涧河”,经折家坪镇、县城宽洲镇、下廿里铺镇、延川县县城大禹街道等地,于延川县延水关镇苏亚河村西南汇入黄河。全长169.9公里,流域面积4078平方公里。[1]年均径流量1.8766亿立方米,年均输沙量5590万吨。[2]
![Thumb](http://upload.wikimedia.org/wikipedia/commons/thumb/3/38/%E8%B7%AF%E9%81%A5%E6%95%85%E9%87%8C%E8%A1%8C_-_panoramio_%283%29.jpg/640px-%E8%B7%AF%E9%81%A5%E6%95%85%E9%87%8C%E8%A1%8C_-_panoramio_%283%29.jpg)
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