Cwm Penanmnen and Sarn Helen Walk

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Route Summary:

7.59 km 285 m

Calculate the time using Naismith’s Rule and factor in your own pace.

Start and Finish:


Check out the businesses nearby for more places to stay and drink.


Remember that we cannot outline every single hazard on a walk – it’s up to you to be safe and competent. Read up on Mountain Safety , Navigation and what equipment you’ll need.

Public Transport: Traveline for UK Public Transport
Parking and Post Code for Sat Nav (where applicable): 

Weather Forecast:

Met Office Snowdonia Mountain Weather

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Cwm Penanmnen and Sarn Helen Walk Route Map and GPX Download

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Summits and Places on this Route

No summits were found but here are a few nearby

Places Nearby:


Cwm Penanmnen and Sarn Helen Walk Details

The valley of Cwm Penmnen lies to the south of Dolwyddelan and is steep sided and afforested. Through this valley, the Romans chose to build the famous Sarn Helen, which can still be followed over the moors towards Ffestiniog.

Most of this route can be mountain biked and the final section of footpath avoided by taking the minor road.

The Route

View the route in full on the Snowdonia National Park website – here.

Dave Roberts

Dave Roberts founded Walk Eryri in 2004, with the aim of providing routes that are off the beaten track. Walk Eryri is now part of Mud and Routes which continues to provide more off beat routes and walks in Snowdonia and beyond. Dave has been exploring the hills of Eryri for over thirty years, and is a qualified Mountain Leader.
Dave also established Walk up Snowdon, Walk up Scafell Pike and Walk up Ben Nevis just to mention a few.

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