OTT Marathon

MAY
16
2026
Take on the OTT Marathon or 10 Mile Race through the Brecon Beacons, with stunning trails over Pen Y Fan and views of Talybont Reservoir. Expect a tough but rewarding day on the hills, with on course aid and a special finisher gift.
Sat 16 May 2026
26 miles 10 miles

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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.

26 mi
Ott Marathon - 26.2 (ish) Miles
10 mi
10 Mile Race

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