This fantastic Elidir Fawr loop takes in 3 neighbouring mountains, as well as offering amazing views in all directions.

Watching the Snowdon Horseshoe from the Elidir Fawr summit can be an incredible experience.

Marchlyn Mawr reservoir is also a stunning creation – a natural mountain lake turned into a hydro electric reservoir.

Distance 5.9 miles

Time 3 hours (walking) 1 hour 20 mins (running)

Total Ascent 2,288ft

OS Maps click to open this route on the OS Maps website

Summits Elidir Fawr, Y Fronllwyd, Carnedd Y Filiast, Mynydd Perfydd.

Views Ogwen Valley, the Glyderau, the Carneddau, the Irish Sea, Snowdon Horseshoe, Welsh coastline.


Elidir Fawr Loop 3D Map | The Frozen Divide



1. Parking at a dead end lane just outside the village of Deiniolen, we take the tarmac reservoir road up to Marchlyn Mawr reservoir. At the reservoir the path there’s a clear stile and single track heading up Y Fronllwyd.


2. The trail then bears right, over the summits of Carnedd Y Filiast (great view of Elidir Fawr from here) and Mynydd Perfydd (great view of Ogwen Valley from here).


3. Continuing around the valley bowl, keeping Marchlyn Mawr on our right, we ascend the craggy path to Elidir Fawr summit. The 360 degree views from here are incredible, taking in Snowdon Horseshoe in one direction and the North Wales coastline in the other.


4. From the summit there’s a scree path that descends to the right, then it’s some hill wandering down to the top of the old quarry. An explore of the quarry leads us back to pretty much where we started.









Leave a Reply

Your email address will not be published. Required fields are marked *