Tidal bore surging up China's Qiantang River.
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Previously:
https://www.homemadetools.net/forum/...159#post195620
https://www.homemadetools.net/forum/...237#post180794
https://www.homemadetools.net/forum/...245#post165583
https://www.homemadetools.net/forum/...452#post166297
https://www.homemadetools.net/forum/...660#post209519