Self-navigate 100 miles through the heart of Wales' wildest mountain national park
Other trail races within 193 miles
A point-to-point crossing of Bannau Brycheiniog (Brecon Beacons) National Park from the ruins of Abergavenny Castle to Llangadog, following the official Beacons Way National Trail. The route traverses the dramatic Black Mountains, crosses Pen-y-Fan (886m) — the highest mountain in South Wales — and ventures deep into the remote Carmarthen Fans. Self-navigation with hardcopy OS maps and a baseplate compass is mandatory throughout; there are no course markings. With 6,143m of ascent over 100 miles, 10 checkpoints, and a 40-hour cutoff, this is a serious mountain ultra that earns UTMB Performance Index and ITRA points. Part of the GB Ultras 100 Mile Grand Slam.
Experienced ultrarunners
Abergavenny, Wales, United KingdomJuly 25, 2026
Must complete a 50 Mile race or longer within the qualification window
Participants must have completed at least one 50-mile ultramarathon under race conditions prior to race day. Solo runs are not acceptable. Experience in mountainous terrain and competent self-navigation using map and compass are required. Minimum age 20 on race day.
| Location | km | Elevation |
|---|---|---|
Start Start | 0.0 | 65 m |
Checkpoint 1 - Skirrid Inn Aid Station | 11.7 | 143 m |
Checkpoint 2 - Llanthony Aid Station | 22.1 | 222 m |
Checkpoint 3 - Crickhowell Parish Hall Aid Station | 43.8 | 83 m |
Checkpoint 4 - Bwlch Village Hall Aid Station | 61.1 | 205 m |
Checkpoint 5 - Talybont car park Aid Station | 75.6 | 416 m |
Checkpoint 6 - Storey Arms Aid Station | 86.3 | 438 m |
Checkpoint 7 - Sarn Helen Aid Station | 97.3 | 351 m |
Checkpoint 8 - Penwyllt Aid Station | 107.5 | 340 m |
Checkpoint 9 - Llandeusant Aid Station | 125.2 | 262 m |
Checkpoint 10 - Mountain View Aid Station | 136.2 | 477 m |
Finish Finish | 161.9 | 57 m |
Sign in to see cutoffs, crew access, drop bags, and services for every aid station.
The Brecon Beacons in late July offer classic British mountain weather — warm and sunny spells mixed with periods of rain and low cloud. Daytime temperatures at valley level can reach 20–25°C, while summits on Pen-y-Fan and the Carmarthen Fans are typically 10–15°C cooler with significant wind chill. Night sections will be cool to cold on the exposed ridgelines. The Beacons receive high annual rainfall, and conditions can deteriorate rapidly. Mandatory waterproofs are strictly enforced and essential regardless of the forecast.
Welsh mountain weather changes rapidly. Clear conditions can deteriorate to low cloud, heavy rain, and strong winds within hours, particularly above 600m on Pen-y-Fan and the Carmarthen Fans.
The Brecon Beacons receive substantial rainfall year-round. July races regularly encounter rain, saturated moorland, and boggy ground on the mountain sections.
Nighttime temperatures on exposed ridges can drop significantly even in July. Wind chill on the Carmarthen Fans during overnight sections can be severe.
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