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ARGUS reader Bob Richards captured this picture of a solitary surfer riding one of the world’s most amazing natural phenomena on the river Severn.

The Severn Bore is a large wave that can be seen in the estuary where the tide can be as high as two metres.

The bore is caused by water being funnelled into an increasingly narrow channel as the tide rises and forms a large wave that travels against the river current for around 25 miles, passing Beachley at Chepstow to Gloucester throughout the year.