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 Severn or Afon Hafren as it's known in Welsh. The Severn Estuary ...

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 community of bore riders has built up around ...

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 ...