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12.4 km / 7.75 miles
706 m / 2,315 feet
5 - 6 hours
Care required in poor visibility at Bwlch Duwynt to find correct path to Corn Du
Moderate with some loose rock on descents off Pen y Fan and Cribyn
Park your car at the junction of the road and a track just short of the Neuadd Reservoir. There are plenty of places to park along the road and space is not normally a problem so early arrival is not essential.
Walk down the road to the Pump House building, turn left here and cross the reservoir's outflow. Once across head half right towards a stile that crosses the fence that surrounds the reservoir. Once over the stile follow the clear path as it climbs, virtually directly up the valley side on ground that is by parts good and boggy. As you reach the top you will see a cutting and the path gains the top of Craig Fan Ddu through this cutting. Turn right and follow the edge of the "summit" plateau climbing gently until the plateau narrows down to a quite narrow ridge. Follow this ridge for a bit over a mile and you will meet the path from Storey Arms coming in from the left. Turn right here and follow the path the short distance to the summit of Corn Du. Keeping the edge on your left walk down to the small bwlch before re-ascending the equally short distance to the summit of Pen y Fan.
Descend to the south east down a badly eroded path to a col where there is a junction of paths. Take the left path and begin the climb (the right hand path contours round Cribyn) up to the summit of Cribyn. Descend the other side down a steep path to the col at Bwlch ar y Fan where an obvious track crosses your path.
Turn right here and descend down an obvious track past the Upper Reservoir. As you approach a wood you will need to cross some gullies that can be quite boggy after a lot of rain. When you reach the corner of the wood follow the track the short distance back to where you left your car.
Suitability for Dogs
Availability of Drinking Water -
Unsuitable Terrain (Bog) -
Unsuitable Terrain (Rock) -
Not normally an issue on this route
Boggy ground on the ascent and in places on the ridge
No scrambling or awkward/dangerous moves for dogs, no sharp rocks. Can be some loose rock near the edges