The Thames Challenge Ultra
England's longest river path – from the source of the Thames in the Cotswolds, to the Thames Barrier in Greenwich, a distance of 184 miles. The challenge is to complete the entire length over a four day period. The Thames Challenge is the 'Sister' event of The Severn Challenge. Each daily Ultra - Cotswold Ultra, Oxford Ultra, Windsor Ultra, Richmond Ultra - can be done individually. 8-11 August.