20:36, 07-Oct-2017
Power of Nature: Massive surging Qiantang tide bore wows spectators
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One after another, three-to-four-meter-high tidal waves smashing into a dam. It happens at this time of the year, every year, on the lower Qiantang River in east China's Zhejiang Province.
And this year, as ever, thousands of spectators have gathered all week along the river to witness the phenomenon. The surging tide is caused by the gravitational pull of the moon. When it comes, the water can rise up to a crest as high as 3-point-5 meters, and the noise it generates is said to sound like thousands of horses running.
However, high tides can also be quite dangerous, and people are killed or injured almost every year. Over the past few decades, it is estimated that more than 100 people have been swallowed by the tidal bore.