OTT Ultra Marathon
Merthyr Tydfil, United Kingdom • 1 Nov 2025
Event details
OTT Ultra 2025 is a trail ultramarathon held on Saturday 1 November 2025 in Merthyr Tydfil. The race distance is 30 miles and the minimum age for entry is 18. Entry places are limited to 200; the listed entry count is 125. Entry fees are shown as UKA member £60.00 and non member £62.00. The event is chip timed and will be cup-less at checkpoints.
Course and logistics
The route starts and finishes at George Town Boys and Girls Club and follows the Taff Trail before turning north alongside the River Taff toward the Beacons Reservoir. The course crosses the A470 and climbs to the summit of Pen y Fan (886 m), then descends Jacobs Ladder to the Roman Road and continues to Torpantau. From there it follows forestry tracks by Dolygaer and Pontsticill Reservoir, drops into the Taff Fechan Nature Reserve and returns along the Taff Trail to the club.
There are five checkpoints; four will offer water and food. Checkpoint 1: Cwm Cadlen Road crossing (6 miles). Checkpoint 2: Pont yr Daf car park (13 miles). Summit check-in/check-out at Pen y Fan. Checkpoint 3: Torpantau Train Station (19.5 miles). Checkpoint 4: Ffynnondwyn on the Taff Trail (26 miles). A 6-hour cutoff applies at checkpoint 3, which requires an average pace of about 19 minutes per mile to reach that point within the limit. Visit the organization's website for the most recent information.