Runners were tested to the limit by the inaugural Cotswold Way Century race, which finished in Bath on Sunday.
The 102 mile, non-stop race, organised by Cotswold Running, started at Chipping Campden in Gloucestershire on Saturday lunchtime and was the first competitive single-stage event of its kind on the trail.
A total of 58 set out on the route but more than half of the field retired before they reached Bath, leaving 25 able to complete within the 30-hour time limit.
Simon Baker of Yeovil broke away from the lead pack in the final ten miles to win with a time of 21hrs 11mins, followed by Nick Weston of Hungerford and Bath Bats runner Damian Hall.
Corsham-based Hall clocked 21:29.
Devon's Sarah Morwood finished joint fourth overall in 21:51 to win the women's race.
"It's an incredibly difficult route," said race director Kurt Dusterhoff.
"But the combination of the challenge and the beautiful landscapes has attracted experienced ultra-marathoners from around the UK."
Heavy fog also hampered navigation overnight but Dusterhoff added: "In spite of the difficulty, or perhaps because of it, the runners raved about the route.
"We hope to make this an annual event, to show off not only the area's beauty, but also to give the country's hardiest runners a chance to test themselves."
