At its head, a tide here can rise about as tall as a four-story building, making a visual splash.

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 ...

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 ...

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 ...

The moon causes a tidal bore that reverses the flow of the river and slows the earth’s spin each day These Brazilians are about to surf in a very unlikely place: the Amazon River. During full ...

The best places to watch the bore are at Minsterworth, Stonebench and Over Bridge, before the river splits into two. But the early stages of the bore can also be seen at Epney, Newnham and Fretherne.