Crowds line the River Bure for the start of the 55th Three Rivers Race at Horning, Norfolk on 30 May 2015. Organised by Horning Sailing Club, this 24-hour event is one of the toughest inland yachting races in Europe. Picture shows the start for the Yare & Bure One Design 'White Boats'. Horning's historic Swan Inn can be seen on the left of the picture. Of the 108 boats entered in 2015, 86 finished in times of between 11 and 18 hours.