A crowd of Chinese tourists run away as a tidal bore breaks over a barrier along the Qiantang River in Haining, east China's Zhejiang province, on August 31, 2011. #

A remote controlled helicopter hovers over the Qiantang River as tourists gather on the river bank to see the soaring tide in Haining, on September 13, 2011. #

People run away from waves caused by a tidal bore which surged past a barrier on the banks of Qiantang River, in Haining on October 8, 2014. #

Visitors run from waves caused by a tidal bore in Hangzhou, Zhejiang province, on August 13, 2014. #

A tidal wave hits a bank along the Qiantang River on August 22, 2013. #

Spectators are swept by huge waves while watching tides on the Qiantang River on August 15, 2014. #

Onlookers struggle to their feet after being being washed down a hill by huge waves in Haining, China, on August 22, 2013. #

More than 660,000 people line the north bank of Qiantang River to watch its annual wonder, the Qiantang River tides, on October 3, 2012. #

Spectators are swept by huge waves while watching tides on the Qiantang River on August 31, 2011. #

Visitors run from a wave caused by a tidal bore which surged past a barrier on the banks of Qiantang River, in Hangzhou, China, on August 30, 2015. #

Policemen and residents try to stay on their feet as waves from a tidal bore surge over a barrier on the banks of Qiantang River in Haining on August 31, 2011. #

Spectators are swept by huge waves brought by Typhoon Dujuan while watching tides of Qiantang River on September 29, 2015. #

Residents run away as waves from a tidal bore surges over a barrier and a vehicle on the banks of Qiantang River on August 31, 2011. #

A tidal wave hits a bank along the Qiantang River on August 22, 2013, in Haining, China. #

Visitors are hit by a wave caused by a tidal bore on the banks of Qiantang River in Hangzhou on October 28, 2015. #

A man clings to a road sign pole to escape the water from a tidal bore in Hangzhou on September 1, 2015. #