8k Run Hirwaun: Challenging Circuit at Llwyn-on Reservoir

Route Overview & Local Insights

Tackle this scenic 9.0km loop that begins with the serene waters of Llwyn-on Reservoir before branching into a more technical, hilly extension through the woodland trails on the western bank. With 127m of elevation gain, this route offers a moderate challenge for runners looking to transition from flat pavement to undulating forest tracks. Approximately 30% of the course is paved, providing solid footing initially, but you will quickly find yourself immersed in the natural, shaded canopies where the terrain becomes more varied and rewarding. It is a fantastic choice for those wanting to escape the more crowded peaks of the Beacons while still testing their climbing legs.

Situated in the heart of the Taf Fawr valley, Llwyn-on is the largest of the three reservoirs in this area of the Brecon Beacons National Park. Once an industrial hub supplying water to the bustling valleys below, the area has since transformed into a lush sanctuary for local wildlife. While running, keep an eye out for buzzards overhead or the occasional red kite. The nearby village of Hirwaun has a deep-rooted history in the iron industry, and as you navigate the forest trails, you are tracing the edges of an ancient landscape that has served both industrial progress and natural preservation for centuries.