The world's largest river—the Qiantang River—had an unusually high 90-foot tidal wave near the river's upper shiplock gate. According to a worker, no waves have ever surged that far up the river.

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On Wednesday, a 90-foot-high tidal wave surged up the Qiantang River near the Sanbao Shiplock. It's located in the capital city of Hangzhou in east China's Zhejiang Province.

[Worker, Sanbao Shiplock]:
"The tidal wave was higher and stronger than that of yesterday, which touched the upper shiplock gate. No waves have ever touched there since the Sanbao Shiplock was first built in 1996."

Qiantang River is well known for its world's largest tidal bore—a tidal wave that runs up a river.

Also known as river bores, these waves may reach 30 feet high during the Mid-autumn Festival, which is the 15th day of the eighth lunar month.