Arenig Fawr via Simdde Ddu Catwalk  No ratings yet.

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Route Summary:

This walk includes the Washi of Arenig Fawr

This walk includes the Hewitt of Arenig Fawr

This walk includes the Nuttall of Arenig Fawr

12.32 km 687 m

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

Start and Finish:

View Facilities

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

View Hazards

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.

Parking :

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Arenig Fawr via Simdde Ddu Catwalk Route Map and GPX Download

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Arenig Fawr via Simdde Ddu Catwalk Details

Arenig Fawr stands almost alone, dominating the landscape around it. There’s an easier route up, but this one is slightly off path! It is a contrasting route that starts off too easily along an old quarry track, but as soon as it finishes, you’re largely on your own. A short, unpleasant, section uphill on boulders and heather, and then it relents, becoming more straightforward as you ascend.

You’re soon high above the lake, and you realise why this route is worth doing! The views from the summit are some of the best in the park as you’re virtually in the dead centre with all the ranges around you.

Distance, Ascent and Time 12.5km, 690m, 4 hours

OS Map Required Explorer 018Landranger 124BMC Snowdonia South,

Difficulties Route finding.

Start / End Arenig

Facilities Parking in lay by.

Public Transport Trains stopped running 50 years ago….

The route starts at the hamlet of Arenig and as there is no public transport, you’ll need a car or a bike to get here. You can park opposite the quarry at SH830 392 where there’s more parking space than this quiet hill will ever need. From the car park, turn right and then left across a stile at a sign. Pull uphill to the track, and then follow this left, keeping to the winding track should be easy if you keep to the most obvious track.

This track takes you quickly up to around 500m, but then the walk becomes a bit more work for a while. Whatever time you made up so far will be lost on the next, relatively short, heather slope. The track ends abruptly at SH853 388, just short of the precipitous Daear Fawr. You’ll need to cross a flat wet section and up the heathery slope towards the wall that you can see crossing the slope.


Choose your line carefully, as nearer the wall you’ll find the ground to be an ankle wrenching mix of loose boulders, moss and heather where none of your footfalls will be confident. Aiming further left and taking a direct line upslope seemed to work best.

Follow the wall for a short while, to the pint where it turns slightly right on a broad ridge and starts threatening to descend, you’ll be at the right spot when you can just about start seeing Llyn Arenig Fawr.  Again you’ll need to set off uphill through the heather. You’ll see on the 1:25k map that there’s a ledge at around 600m following the last crags of Daear Fawr and avoiding further craggy ground to the east, this is what you’ll be aiming for.

The going is initially heavy, but skirting around the crags, and straight onto their top, you find the ground steepness and heather cover eases. There’s also a definite, if vague, path which soon takes you to the edge of the Simdde Ddu cliffs of on a delightful, if airy, path. On a fine day, this is one of the finest short stretches of path that I’ve found – being more so as it appears from nowhere.


The track again becomes intermittent, but the ground is easy, as far as Bwlch Blaen y Nant, where you’ll join up with the Arenig Bothy track. This gently rises across Arenig Fawr’s eastern flanks, before taking a final, rocky pull up to the summit. You can then descend by either route detailed in this route, we chose to descend via the bothy, which is the shorter of the two and easier.

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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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