Llwyn-Onn Reservoir

The Llwyn-Onn Reservoir is a 5.1 km looped trail that starts and ends in , Merthyr Tydfil, Wales. Based on our data, the hike is graded as Easy. For information on how we grade trails, please read measuring the difficulty of a hiking trail on hiiker. Also, check our latest community posts for trail updates. This hike can be completed in approx 1 hrs 8 mins. Caution is advised on trail times as this depends on multiple variables. For more info read about how we calculate hike time.