古榕江,位于中国广西壮族自治区西部,是右江右岸支流,发源于天等县把荷乡汤淰村东南900米处,东北流经若兰水库 、向都镇和田东县江城镇,于思林镇达陇屯北汇入右江,下游又称达腊河,“达腊”为古名“大罗溪”的状语读音。干流长110千米,流域面积1179平方千米。古榕江上游灰岩地貌,岩溶发育。流域内地下河水系发达,地下河补给面积超过510平方千米。[1]
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