北之江,又称青水河,位于中国广西壮族自治区中部,是西江红水河段左岸支流,发源于柳江县土博镇黄甘村西200米,西南流入忻城县境后转东南流,在忻城县安东乡国辉村那朝屯潜入地下,在来宾市兴宾区七洞乡西北地下河出露,东南流至来宾市区城北街道磨东村西南1.5千米处注入红水河。干流长96千米,平均比降2.34‰,流域面积1403平方千米,地下河补给面积382.5平方千米。流域内岩溶广布。[2]
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