The RIDUM

Discover the spectacular, lesser-known ridges encircling Cardiff at The RIDUM, a 30-mile ultra marathon set for Saturday, 5th September 2026. This challenging loop follows the Rhymney Valley Ridgeway Walk, delivering 4,402 feet of ascent and breathtaking panoramic views across South East Wales from its high points like Mynydd Machen. Starting and finishing at Parc Penalta, the route is a perfect blend of 90% runnable trails and quiet country lanes, offering a true taste of Welsh uplands just a stone's throw from the capital. Renowned for its incredible community spirit and fully-stocked checkpoints, the event focuses on personal adventure over strict cut-offs, inviting you to soak in the scenery and camaraderie. As the final race in the prestigious Pegasus Slam series, it's the ultimate way to cap your ultra season or a fantastic standalone challenge. Lace up for a professionally organised, friendly, and authentically Welsh trail experience that proves the best views often lie just beyond the city's edge.