Nantlle Ridge Extended
The Nantlle Ridge Extended is a 32 km fell-running circuit extending the classic Nantlle Ridge traverse in Snowdonia — adding the Moel Hebog group and the Mynydd Mawr ridge for a comprehensive round of the ridges above the Nantlle valley.
This route has no official waymarking. Serious navigation experience is required — do not rely on GPS alone. Carry OS 1:25,000 maps and study the line before you go.
About Nantlle Ridge Extended
The Nantlle Ridge is one of Snowdonia's finest ridges — a narrow, exposed crest above the Nantlle valley with dramatic views to the Lleyn Peninsula and Cardigan Bay. The classic traverse is 15 km; the Extended version loops back via Moel Hebog and Mynydd Mawr to make a complete circuit of the valley.
At 32 km with around 2,200 m of ascent, it is a demanding single-day challenge. The Nantlle Ridge itself involves narrow paths and some scrambling — care needed in wet conditions.
The route
From Rhyd Ddu: ascend Y Garn (633 m) and traverse the Nantlle Ridge to Craig Cwm Silyn (734 m) and Mynydd Graig Goch. Descend to Nantlle and ascend Moel Hebog (782 m). North to Mynydd Mawr (698 m). Return to Rhyd Ddu via the eastern slopes.
Getting there & logistics
Base: Rhyd Ddu. Train on the Welsh Highland Railway from Caernarfon and Porthmadog (scenic narrow gauge).
Best time: April to October.
Safety
The Nantlle Ridge involves some exposed scrambling on narrow paths. Care needed in wet or windy conditions. In an emergency: call 999 or 112, ask for Police then Mountain Rescue. Llanberis MRT covers this area. Pre-register SMS 999.
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