In a few places on Earth, local geography and tidal conditions align to cause a phenomenon called a tidal bore: An incoming high tide collides with the outgoing tide in a narrow channel, generating a turbulent wave front. The shape and size of a bore tide varies greatly, from gentle undulations to a powerful single wave rolling over any obstacle in its path. China's Qiantang River claims the highest bore, up to 9 meters (30 ft) high. In other places, such as Alaska's Turnagain Arm, Brazil's Amazon River, and the River Severn in the UK, surfers paddle out and try to catch the bore tides for a quick trip upstream.
A remote controlled helicopter hovers over the Qiantang River as tourists gather on the river bank to see the soaring tide in Haining, Zhejiang province, on September 13, 2011.
(Reuters/Stringer)
A tidal wave hits a bank along the Qiantang River on August 22, 2013 in Haining, China.
(ChinaFotoPress/ChinaFotoPress via Getty Images)
Spectators flee as waves created by a tidal bore crash over a barrier on the Qiantang river at Hangzhou, in east China's Zhejiang province, on August 31, 2011.
(AP Photo)
A crowd of Chinese tourists run away as a tidal bore breaks over a wall along the Qiangtang River in Haining, China, on August 31, 2011.
(STR/AFP/Getty Images)
Policemen and residents run as waves from a tidal bore surge past a barrier on the banks of Qiantang River in Haining, China, on August 31, 2011. As Typhoon Nanmadol approached eastern China, the tides and waves in Qiantang River recorded their highest level in 10 years, local media reported.
(Reuters/China Daily)
A crowd of Chinese tourists run away as a tidal bore breaks through the dam by the Qiangtang River in Haining, east China's Zhejiang province on August 31, 2011. About 20 people were injured when they were caught too close to the river while viewing the annual tidal bore, which occurs when sea water from an unusually high tide funnels into the river, creating high waves.
(STR/AFP/Getty Images)
South of Anchorage, Alaska, the biggest bore tide of the summer roared into Turnagain Arm on June 5, 2012. Here, a kayaker awaits the bore tide to ride it.
(AP Photo/Ron Barta)
A kayaker rides the biggest bore tide of the summer as it roared into Turnagain Arm south of Anchorage, Alaska, on June 5, 2012.
(AP Photo/Ron Barta)
Brazilian surfer Savio Carneiro celebrates as catches the thunderous "Pororoca" tidal bore wave during the national pororoca circuit final on the Mearim River, some 30 km inland, in the Amazon jungle near the northern Brazilian city of Arari, on April 19, 2003. The term "Pororoca" comes from the Amazonian indigenous term meaning "destroyer, great blast." The feared and thunderous waves have capsized boats and washed away most anything in its path.
(Reuters/Sergio Moraes)
Surfers Adilton Mariano and Rodrigo Resende ride the Pororoca wave in the Araguari river in northern Brazil, on May 18, 2003.
(AP Photo/Enrico Marone)
Villagers ride the Pororoca wave in a canoe as it passes near their town of Sao Domingos do Capim, northern Brazil, on March 12, 2001.
(AP Photo/Paulo Santos)
Brazilian surfer Rogerio Dantas jumps into the Mearim River to catch the thunderous Pororoca tidal bore wave, near the northern Brazilian city of Arari, on April 17, 2003.
(Reuters/Sergio Moraes)
A surfer rides the Pororoca tidal bore on the Amazon river near Caviana island in Marajo, Brazil, on June 17, 2011.
(Reuters/Paulo Santos)
A boat fails to escape a Pororoca wave on Brazil's Mearim River, on April 6, 2004.
(Reuters/Bruno Domingos)
Brazilian surfers rides the Pororoca wave on the Mearim River, near Arari, Brazil, on April 8, 2004.
(Reuters/Bruno Domingos)
A view of the Severn Bore, sweeping down the river Severn between Stonebench and Minsterworth, in Gloucestershire, England, on September 3, 1936. At times the waves reached a height of 20 feet.
(AP Photo)
Surfers ride the Severn Bore near Newnham along the River Severn on March 2, 2010 in Gloucestershire, England. Surfers from around the world flocked to ride the Severn bore, a natural tidal phenomenon that pushes a 4ft wave up the Severn Estuary in Gloucestershire.
(Matt Cardy/Getty Images)
Surfers enjoy the Severn Bore near Newnham along the River Severn on March 2, 2010 in Gloucestershire, England.
(Matt Cardy/Getty Images)
Surfers round a corner on the Severn Bore along the River Severn on March 2, 2010 in Gloucestershire, England.
(Matt Cardy/Getty Images)
The incoming spring tide on the River Severn in Gloucestershire, on March 2, 2010. Original
here.
(CC BY ND Flickr user PapaPiper)
A tidal wave hits a bank along the Qiantang River on August 22, 2013 in Haining, China. Typhoon Trami landed in Fujian province earlier and led to higher-than-normal tides, gales and heavy rainfalls in east China.
(ChinaFotoPress/ChinaFotoPress via Getty Images)
Visitors run away as waves from a tidal bore surge past a barrier on the banks of Qiantang River, in Hangzhou Zhejiang province, on August 24, 2013.
(Reuters/Stringer)
Visitors run away from a tidal bore wave as it surges over a barrier on the banks of Qiantang River, in Hangzhou Zhejiang province, on August 25, 2013.
(Reuters/Stringer)
People struggle as waves from a tidal bore pour over a barrier on the banks of Qiantang River in Haining, China, on August 22, 2013. As Typhoon Trami landed in eastern China, tidal level in the Qiantang River was recorded at 6.6 meters high with a surge reaching 1.3 meter high, local media reported.
(Reuters/China Daily)
People struggle as water from a tidal bore wave surged over a barrier on the banks of Qiantang River in Haining, China, on August 22, 2013.
(Reuters/China Daily)
Spectators get to their feet, after being swept down a hill by huge waves while watching tides of Qiantang River on August 22, 2013 in Haining, China. (ChinaFotoPress/ChinaFotoPress via Getty Images)
A crowd of Chinese tourists run away as a tidal bore breaks over a wall along the Qiangtang River in Haining, Zhejiang province, China, on on August 31, 2011. Visitors gathered to experience the Qianjiang Tidal Bore, an annual tradition for the residents living nearby.
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