The Severn Bore
As the Severn Estuary travels from the Bristol Channel to Gloucester, the River Severn, trapped between South Wales, Somerset and Gloucestershire becomes rapidly more narrow and more shallow. At least 12 times a year, (during the spring and autumn equinox) this geographical formation, coupled with exceptionally high lunar tides, produces a wave of water at least four feet high - but sometimes as much as 10 feet. Called the Severn Bore, It races up river, against the current, at speeds of between five and eight miles per hour and surfers travel from all over the world to catch it.
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How to See It
The Severn Bore is visible from a variety of viewpoints in Wales and Gloucestershire. The simply named Severn Bore website, put together by local expert and enthusiast Russell Higgins, provides comprehensive information on when the bore will occur and where it is best seen. There is a lot of useful information, such as which areas have lots of ambient light for best night viewing without a full moon and where parking areas might be flooded at high tide.