Darwin Barra Crab fishing tours filmed this tidal bore hitting their boat on the Daly River in the Northern Territory. Courtesy: MultiRiver01
A FISHING charter group has caught on camera a rare event that sees a single wave push hundreds of kilometres up a river.
Carl Skyring of Darwin Barra and Crab was on the Daly River on March 24 when he caught the wave, known as a tidal bore, on camera.
A tidal bore is a phenomenon where the leading edge of the incoming tide forms a wave of water that travels up a river or narrow bay against the direction of the river or bay's current.
The Daly is believed to be one of just three locations where tidal bores regularly occur in Australia.
Mr Skyring said he has seen tidal bores several times before in the Daly, but this one was different.
"You don't normally see them this early in the year," he said.
"You usually see them about May when the water levels start to drop."
This one was filmed on March 24. On that day, a 1.7m low tide was recorded at 2.45pm, before a 7.1m high tide at 8.40pm.
Mr Skyring said when he had seen them in the past, they were just "swells that passed harmlessly under the boat".
"This was the first time I had seen one break," he said.
In China, locals and tourists gather along the banks of the Qiantang River every year to witness one of the most powerful bores in the world.
It often reaches more than 9m in height and speeds of more than 40km/h, and attracts many surfers who attempt to ride the waves up the river.
In 2014, many were injured as the bore was stronger than usual due to the effects of a supermoon.
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