Meirionnydd Round
The Meirionnydd Round is a 70 km mountain challenge in Snowdonia's southern ranges — visiting the Rhinogydd, the Aran ridge and the Cadair Idris massif in a circuit of the high ground south of the Mawddach estuary.
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 Meirionnydd Round
The Meirionnydd Round covers the mountain terrain of historic Meirionnydd (now Gwynedd and northern Ceredigion) — the Rhinogydd, the Aran range and Cadair Idris. These are quieter, rougher mountains than the northern Snowdon and Glyderau ranges, with more pathless terrain and a wilder character.
At around 70 km with approximately 4,500 m of ascent, it is a strong single-day or overnight challenge for experienced mountain runners. Navigation is essential on the Rhinogydd — the scramble-covered moorland between the Harlech coast and the Mawddach is trackless and complex.
The route
Rhinogydd (~25 km): The roughest section. Rhinog Fawr (720 m), Rhinog Fach, Y Llethr — pathless quartzite and heather. The most technically demanding navigation of the round.
Aran ridge (~20 km): Aran Fawddwy (905 m, the highest summit in Wales outside Snowdonia) and Aran Benllyn — a long, clear ridge with good visibility.
Cadair Idris (~25 km): Penygadair (893 m) — approached via the southern Minffordd path. Long descent to the Mawddach.
Getting there & logistics
Base: Dolgellau — the natural hub of Meirionnydd, with good facilities and transport links. Bus from Machynlleth and Barmouth.
Best time: May to September.
Safety
The Rhinogydd are the most navigationally demanding section — rocky, pathless, and confusing in mist. Cadair Idris has steep northern cliffs. In an emergency: call 999 or 112, ask for Police then Mountain Rescue. Aberdyfi MRT covers Cadair Idris. Pre-register SMS 999.
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