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Page last updated at 15:39 GMT, Tuesday, 8 February 2011

Where in Gloucestershire is the source of the Thames?


Little Britain star David Walliams has announced that he is going to swim along the length of the River Thames to raise money for Sport Relief.

The river officially starts near Cirencester, but where does it begin exactly?

In September 2010, BBC1's Countryfile presenter Ellie Harrison went on a mission to find out.


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