8k Run Betws y Coed: Scenic Loop Around Llyn Elsi

Route Overview & Local Insights

This 8.4km loop offers a quintessential Welsh trail running experience, climbing out of the village of Betws-y-Coed into the serene heights of the Gwydir Forest. With 255m of ascent, you’ll face a steady initial climb on well-maintained forestry tracks and paved sections before being rewarded with the glassy waters of Llyn Elsi. The terrain is varied but manageable, featuring a blend of wide paths and technical stretches of the Snowdonia Slate Trail. It’s a moderate challenge that balances a lung-busting ascent with a fast, flowing descent back toward the valley floor, making it perfect for runners looking to transition from road to trail while soaking in epic mountain vistas.

Steeped in local history, the route circles the Victorian-era reservoir of Llyn Elsi, which has provided water to Betws-y-Coed since its dam was constructed in 1899. As you navigate the loop toward Clogwyn-Brith, you are running through the heart of Snowdonia’s industrial heritage; the final stretch follows the Snowdonia Slate Trail, a route that honors the region’s status as a UNESCO World Heritage site. Keep an eye out for the Monument to the Welsh Bible, and take a moment to look west toward the Moel Siabod peak—the "sentinel" of the valley—which dominates the skyline throughout this historic forest run.