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为什么说京杭大运河是世界上最长的人工河？
京杭大运河是世界上最长的人工河，主要是因为其全长约1794公里，贯通五大水系，连接南北经济文化，历史悠久且工程规模巨大。
1、长度最长：京杭大运河全长约1794公里，远超其他人工河，如苏伊士运河（约193公里）和巴拿马运河（约77公里），是世界上最长的人工河。
2、贯通五大水系：京杭大运河连接了海河、黄河、淮河、长江和钱塘江五大水系，沟通了中国南北的交通运输，这种跨流域的水利工程在世界上极为罕见。
3、历史悠久且工程规模巨大：京杭大运河开凿于公元前486年，至今已有2500多年历史，是世界上最古老且仍在使用的人工河。其工程规模巨大，与长城、坎儿井并称为中国古代三大工程。
总结：京杭大运河是世界上最长的人工河，主要是因为其全长约1794公里，贯通五大水系，连接南北经济文化，历史悠久且工程规模巨大。
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