Severn bore, Tidal bore at River Severn, England
The Severn Bore is a tidal wave that forms when rising tides push through the funnel-shaped Bristol Channel and create a powerful surge moving upstream along the river. The phenomenon appears as a visible wall of water that travels inland, moving large volumes of seawater against the river's normal flow.
The phenomenon shaped shipping traditions for centuries as it affected river navigation. The opening of the Gloucester and Sharpness Canal in 1827 reduced its importance for transporting goods upstream to Gloucester.
Since the 1950s, surfers and water sports enthusiasts have gathered at certain river sections to ride the tidal waves. This activity has become an important part of local leisure culture and draws visitors from across the world.
The event occurs roughly 130 days each year, with the most dramatic conditions during spring tides. Check current forecasts before visiting to time your arrival correctly and find the best viewing location.
The surge can reach speeds around 20 km/h and form waves up to two meters high during spring tides. This raw power makes it an exciting yet hazardous spectacle for those watching from the riverbank.
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