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and Yangtze rivers.

The construction of the Grand Canal greatly altered the rivers of the Hai River basin. Previously, the Wei, Ziya, Yongding, and Bai Rivers flowed independently of each other into the sea. The Grand Canal cut through the lower reaches of these rivers and fused them into one outlet in the form of the current Hai River.

During the Song dynasty, the Hai River was considered the lower section of the

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