He rides what is known as a tidal bore: a surge caused by tidal changes – in this case in the Bristol estuary – that creates a wave large enough to surf. An enthusiastic and close-knit ...

China’s Qiantang River has the world’s largest tidal bore, which can go up to 30 feet high and 25 miles per hour. The strongest bores are formed in the fall, making the region a hotspot for ...

Watch a clip from the BBC One series, Coast to learn more. The Severn Bore is a unique phenomenon that occurs when a large tidal surge pushes sea water up the Severn Estuary and into the River ...

Bore heights vary, depending on the weather and tidal range. The biggest, rising to 3ft-4ft, can be breathtaking, capable of propelling canoeists and paddleboarders for miles and washing unwary ...