This is a great walk in one of the UKs most rugged mountainous areas. This is a remote and exciting location for a awesome adventure. I suggest you take warm clothes, food and drink with you as well as some waterproofs as the weather here can change quickly. Take 2 maps O.S. Outdoor Leisure 17 & 18 and a compass (make sure you know how to use them on this walk). Park in Capel Curig (LL24 0EE) at the Tyn Y Coed Inn.
Walk out of the car park and turn right and walk towards Pont Cyfyng. As you walk on your right, opposite an old fashioned red telephone box next to a quaint wooden bus shelter, is a small road which crosses over the river via a stone bridge. Turn right and follow this road.
After the bridge go right up the narrow tarred lane and over another cattle-grid. This rises to a sharp bend, where a footpath diversion is signed. Take this to avoid Rhos Farm. Bear left along the rough old quarry road beside the abandoned cottage. Simply remain with this remarkable roadway, the distinctive, sharp peak of Siabod directly ahead. Climb a series of ladder stiles to reach a path, beside a small lake. Beyond this, climb up the slatey path to reach the edge of an eerie, water-filled pit, the flooded remains of a quarry above old buildings. Pass to the left of this, climbing over the next rise to reach lonely Llyn y Foel.
Your target is the steep ridge of Daiar Ddu, angling up to the right beyond the lake. There are paths to either side of the lake, bringing you to a rough path that has been forged up between boulders and crags, here and there marked by cairns. It’s a fairly short but steep climb to gain the top and the summit of Siabod. Your reward is a truly spectacular panorama of most of the greatest peaks in Snowdonia.
Turn right along the ridge, gradually descending the path just away from the steep drops for about 400 yards. Keep an eye out to the left. When you can clearly see the forest below, and Plas y Brenin (white buildings) at the right end of the lake beyond, pick a path across the grassy slopes, heading for Plas y Brenin. There’s no path at first, but you should soon find a stony path winding down towards the woods. This will bring you to a ladder stile through a fence about 300 yards west of the trees – if you come up against the woodland edge simply turn left and trace the fence to the stile. Below the stile the path is awkward underfoot for a while before entering the edge of the woods. Climb two ladder stiles. About 100 yards after the second, keep right at the fork to reach a forest road. Turn right a few paces, then go left along the path into the trees beside a ruined building. At a cross path turn right, then swing left to descend through a newly replanted area of conifers. Re-cross the bridge behind Plas y Brenin, pausing to drink in the sublime view up to the “Snowdon Horseshoe.” Rise to the road and turn right, at the junction turn right again and walk back to the car.
Don’t attempt this walk in wet weather – the slate bedrock is very slippery and restricted visibility will make the descent from Siabod difficult.