Beacons 100 Miles

View all races for Jul 2026

Race Across Bannau Brycheiniog is a 100 mile trail ultramarathon that follows the Beacons Way National Trail through Bannau Brycheiniog National Park. Starting at Abergavenny Castle, the route passes through the Black Mountains before crossing landmarks including Llanthony Abbey, Pen-y-Fan and the Carmarthen Fans, with more than 6,100 metres of ascent across some of South Wales' most spectacular mountain scenery.

The event is designed for experienced ultramarathon runners and requires competitors to navigate independently using a map and compass between checkpoints. Live GPS tracking, dedicated event support and optional transport back to the start are provided, while eligible finishers can also earn UTMB Performance Index and ITRA points.

Race Across Bannau Brycheiniog is an excellent choice for experienced runners searching for a 100-mile trail race in Wales. The combination of technical mountain trails, significant elevation, self-navigation and the iconic Beacons Way route makes this Bannau Brycheiniog ultramarathon a standout event for runners preparing for major mountain ultras or seeking one of the UK's toughest trail running challenges.

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