Back for a third time! A Midwinter Long Marathon of 28 miles and a 14-mile Half Marathon, based in Chagford in the north-eastern corner of Dartmoor.
The routes follow ancient trails passing many stone circles and abandoned settlements across the north of the Moor, a land of myths and legends.
It will be a supreme challenge at this time of the year on Dartmoor.
GPS trackers will be used to follow the Marathon runners.