40.4031093°N 116.5226322°E 懷沙河是位於北京地區的一條河流，注入懷柔水庫。
發源於懷柔區沙峪鄉南，先後流經三岔村、沙峪、辛營，在懷柔城區附近匯入懷柔水庫。全長28.7 公里，流域面積175.2平方公里，年平均流量4765萬立方米。
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