欧肯河位于中国内蒙古自治区东北部,是嫩江上游右岸的一条支流,发源于鄂伦春自治旗中部南樟松岭村(隶属黑龙江省大兴安岭地区加格达奇区白桦乡管辖)东南,蜿蜒向东南流经鄂伦春旗大杨树镇四平山村、欧肯河农场莫力达瓦达斡尔族自治旗国营欧肯河农场(原欧肯河镇)等地,过莫力达瓦红彦镇欧富村后转东北流,至老董点西北汇入嫩江。河流全长163千米,流域面积1602平方千米,河道平均比降2.23‰,年均径流量3.41亿立方米。欧肯河流域上游为浅山区,多林木;中下游两岸土地肥沃,是重要的商品粮产地。[1]

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