The Thames is the longest and best-known river in Britain. It is 210 miles/338 kilometres long and flows from the Cotswolds in central England to the North Sea after through London. Other famous towns on the river include Oxford, Windsor 1, Henley and Greenwich. Well- known bridges across the Thames in London are London Bridge, Tower Bridge and Westminster Bridge. Large ships can sail up the Thames as far as London and smaller ones a further 86 miles/138 kilometres. A large area in the east of London was formerly a major port on the river, but in recent times this Docklands area has been revitalized.The Thames Barrier is a large barrier to be built across the River Thames at Woolwich, east of London, to prevent London from being flooded. It was completed in 1982 and officially opened in 1984. It consists of ten gates, which lie on the bottom of the river when the barrier is not required. If there is a danger of flooding, the gates rise to form a solid wall 50 feet/15 metres high
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