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12.7 km / 7.9 miles
1,177 m / 3,860 feet
4.5 - 5.5 hours
Care required to find the correct route between Mynydd Perfedd and Y Garn in poor visibility
No scrambling but rocky walking on the summit of Elidir Fawr
Moderate with some rocky paths mostly surrounding the summit of Elidir Fawr
Park your car in the large car park in the village of Nant Peris (this is also the car park for the Pen y Pass Park and Ride bus). This is a large car park so early arrival is not essential.
Leave the car park and turn left on to the road, walk a short distance passing the Vaynol Arms and crossing a small bridge. Immediately after the bridge turn right up a small lane alongside a chapel. Bear left at a fork in the lane and walk about 400 metres to a farm. Pass the farm on your left and walk about 200 metres to the lane end at another farm. Turn right onto a path which crosses fields before coming to a ladder stile. Cross the stile and follow a small stream until you reach a small bridge. Cross the bridge and follow a further stream up the hillside to a second ladder stile. Cross the stile and turn left to ascend to the ridge. Once on the ridge turn right and follow the ridge line to the summit of Elidir Fawr over increasingly rocky ground.
Descend, slowly at first, down a narrowing ridge with opening views to the left over Marchlyn Mawr (the storage lake for the Power Station), Mynydd Perfedd and Carnedd y Filiast to the low point at Bwlch Y Marchlyn. Turn left and climb the short distance to the summit of Mynydd Perfedd. At this point you can take a diversion, if you wish, across flattish ground to Carnedd y Filiast with views out toward Anglesey and the Irish Sea. If you decide to do that retrace your steps back to Mynydd Perfedd (this diversion will add 1.8 km and 42 metres of ascent to the walk). Head southwards following the top of the line of crags with views up Nant Ffrancon towards Llyn Ogwen. The ground is very flat until the line of crags turns south east. Here you can either follow the crag line and climb to the summit of Foel-goch or you can continue south and by-pass the summit. From the summit follow a line of fence posts south until you meet the other path. About this time the path turns south east and begins to climb, steeply, to the summit of Y Garn. Y Garn is a wonderful viewpoint and virtually all the iconic Snowdonia mountains are visible from here.
Follow the crag line round for a short distance before taking the obvious descent path southwards down a grassy slope to Llyn y Cwn. At Llyn y Cwn turn right (roughly west) and take the well trodden path. Initially this is a gentle descent across grassy slopes but, as the Afon Las grows the descent steepens and the terrain becomes more rocky. Eventually you are funneled into a ravine alongside the stream. At the bottom of the ravine you cross over a wall into fields. Leave the stream behind and cross a few stiles until you come to the road. Turn right and walk the kilometre or so back to the car park.
Suitability for Dogs
Availability of Drinking Water -
Unsuitable Terrain (Bog) -
Unsuitable Terrain (Rock) -
Not a problem anywhere on this route
Not much boggy ground
There is a boulder field on the summit of Elidir Fawr