OTT Marathon
Dol-y-Gaer, United Kingdom • 16 May 2026
Event information
The OTT Marathon & 10 Mile Race takes place on 16 May 2026 at Parkwood Dolygaer, Merthyr Tydfil, CF48 2UR, in the Brecon Beacons. Distances offered:
- Marathon - 26.2 (ish) miles
- 10 Mile Race
Minimum age is 18 on the event date. Entries open 27 July 2025 and close 9 May 2026. Entry fees listed are: UKA member marathon £55, non-member marathon £57; UKA member 10 miles £24, non-member 10 miles £26.
Course, checkpoints and kit
The event is a looped trail course that starts and finishes at Parkwood Dolygaer. The marathon route goes over Pen Y Fan from Graig Fan Ddu, up Fan Y Big, then past Talybont Reservoir and the final climb to Tor y Foel. There are three marathon checkpoints at about 7 miles, 14.5 miles and 20.5 miles. A cutoff applies at the 20.5 mile checkpoint of 6 hours. The 10 mile race follows the marathon route to Checkpoint 1, then leaves the marathon route to return to Dolygaer; the 10 mile requires a check-in at Checkpoint 1.
Aid stations will include food items. All marathon finishers receive a coaster and a buff. Compulsory marathon kit includes a charged mobile phone, minimum 1 litre hydration, foil blanket or bivvy, 400 kcal emergency rations, basic first aid, head torch, compass, whistle, waterproof jacket and trousers, warm layer, hat and gloves, and a rucksack with a reusable cup. Compulsory 10 mile kit includes a first aid kit, bivvy or foil blanket, 500 ml water, waterproof jacket and a reusable cup. Visit the organization's website for the most recent information.