吉安溪位于台湾东部,昔称豆兰溪 [1],又因七脚川事件称为七脚川溪[2],为一县市管河川,干流长度11.40公里,在花21线乡道吉安溪桥处有一分流-中原排水沟,流域面积42.16平方公里[3],分布于花莲县中北部,包含花莲市南端及吉安乡北部。主流发源于标高1,321公尺之吉安山东侧[4],向东南东流经庆丰、胜安、宜昌、仁里后,沿著吉安乡、花莲市边界,于普照桥附近注入太平洋[5]。
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