OTT Marathon
Dol-y-Gaer, United Kingdom • 16 May 2026
OTT Marathon & 10 Mile Race takes place at Parkwood Dolygaer, Merthyr Tydfil, in the Brecon Beacons. The event offers two distances: a looped mountain marathon of about 26.2 miles with steep climbs and stunning views, and a 10-mile option that follows part of the same course to Checkpoint 1 before returning to the finish. The marathon features three checkpoints and a 6-hour cut-off at 20.5 miles. The route ascends Pen Y Fan via Graig Fan Ddu, then Fan Y Big, reaches Talybont Reservoir, and finishes with Tor y Foel. Compulsory kit is required, and finishers receive OTT memorabilia. Visit the organization's website for the most recent information.