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Western Idris Hills 3 days / 14 miles (22km)

OS Route Map → Map GPX Route file →

Date: 15 May 2025
Start: Barmouth / Finish: Dolgellau.
Maps: Explorer O23 Cadair Idris & Llyn Tegid.

Day 1Braich Ddu4.8miles / 1952 feet (7.7km / 595m)
Day 2Craig-y-llyn, Tyrrau Mawr, Llyn y Gadair & Llyn Gafr5.2miles / 1350 feet (8.4km / 411m)
Day 3Fox's path & Nant y Ceunant3.6miles / 99 feet (5.7km / 30m)
Beneath the Cadair cliffs

A hike through the western hills of the Cadair Idris range, including first visits to two mountain lakes.

The outward line crosses the Mawddach estuary to ascend to the westernmost hill Braich Ddu and traverses the cliffs of Craig-y-llyn and Tyrrau Mawr to the major path junction at the centre of the range.

The mid-section follows a line below the cliffs of the eastern mountains to the corrie lake of Llyn y Gadair. The descent follows the lower section of the Fox's path to the lane near the Gwernan Hotel, leading to the fine woodland track that borders the Nant y Ceunant down to Dolgellau.

This extraordinary long spell of dry weather for Spring and early Summer continues, blue skies and sunshine for days on end in many parts. With a forecast of west Wales for the best conditions, we set off on this route that I mostly designed a few years ago, the section from Braich Ddu onwards being the intended latter part of our ill-fated Western Tarrens trip.

Below the Cadair cliffs the route uses a path, shown on the map as a pecked line, that I have never seen described anywhere except in a book from 1991 that briefly mentions its existence. In our new enforced slackpack mode, an unknown path in a mountainous region is a risk, this time we got away with it but only after much debilitating effort.

The first half of the trek is the unfashionable western arm of the Cadair galaxy where few walkers venture, but was completely deserted despite the unbroken sunshine. The big surprise though was the eastern half where we saw only three walkers. The Fox's path and lakes were deserted too.

Day 1 - Braich Ddu

Barmouth Bridge now has an additional plaque commemorating the recent years of extensive restoration work. There were crystal clear views across the Mawddach sands towards the western hills.

View from Barmouth bridge
View from Barmouth bridge (14 May 2025__11:58:07)
Across the estuary sands from Barmouth bridge
Across the estuary sands from Barmouth bridge (14 May 2025__12:09:43)

From the A493 a footpath ascends southwards through lovely woodland, briefly joining the Wales Coast Path and leaving it to climb an old forestry track where a small broken sign warns of 'Forestry Operations'. A short way up we met the first of several fallen trees, very easy to pass through until the last couple approaching the byway: for one of them we were down with our stomachs flat on the ground and inching forward with our forearms, for the other we found that walkers had forged a thin line around the whole tangled mess. Just beyond this we reached the byway track via a gap in the fence (with another broken forestry operations sign).

We turned left on the track to reach a gate into Access Land where a thin path cuts off the field corner and ascends north-eastwards near the forestry fence to the summit of Braich Ddu. There were grand views over the Mawddach estuary to the southern Rhinogydd and the distant hazy outline of the Llyn Peninsula. Around the forest corner we found a good pitch spot with a view to the western line of hills ahead. The breeze was surprisingly chilly here and we soon had our fleeces on.

Southern Rhinogydd from Braich Ddu
Southern Rhinogydd from Braich Ddu (14 May 2025__17:23:51)
Pitch on Braich Ddu
Pitch on Braich Ddu (14 May 2025__17:57:22)

Day 2 - Craig-y-llyn, Tyrrau Mawr, Llyn y Gadair & Llyn Gafr

Continuing around the forest edge to the end of the trees on another glorious morning, a path cuts off the corner and heads directly to the edge of the crags of Craig-y-llyn, giving a good view along the ridge ahead with Llyn Cyri coming into view below the craggy drop. Near the top the path switches to the eastern side of the fence for the descent and subsequent climb to Tyrrau Mawr. The land rises a little on the westward side of the fence and a stile gives access to the last few metres to gain the true summit on the edge of the precipitous drop.

The westward view towards the estuary highlights Llynnau Cregennen and the small rugged hill group of Bryn Brith and Pared y Cefn hir, while the Pony Path ascending to the main eastern mountains is clearly seen ahead.

Early view along the western ridge
Early view along the western ridge (15 May 2025__08:58:00)
Braich Ddu & Llyn Cyri from Craig-y-llyn
Braich Ddu & Llyn Cyri from Craig-y-llyn (15 May 2025__08:59:15)
View towards the Mawddach estuary from Tyrrau Mawr
View towards the Mawddach estuary from Tyrrau Mawr (15 May 2025__12:26:27)
View ahead to the Cadair ridge from Tyrrau Mawr
View ahead to the Cadair ridge from Tyrrau Mawr (15 May 2025__12:28:10)

We descended to the major central Cadair path junction where we had expected to see many walkers on a day like this, but only one appeared.

The traversing path towards Llyn y Gadair, as confirmed by our GPS mapping, starts just a few metres down the Pony Path and is an easily missed thin grassy line, no more than a sheeptrod. We set off apprehensively along this obviously little used path but it slowly asserted itself and its course ran true to the mapped line, becoming quite clear until it approached a wire crossing fence in rough heathery terrain. There is no stile here and various faint lines could be discerned where walkers had tried different points to cross. We crossed after a laborious struggle and surveyed the scene.

Ahead is a sort of shallow hanging valley and we could see a clear line heading along its floor towards the distant rock field at the base of the corrie cliffs. After a bit more heathery toil the path improved considerably and appeared well walked, boosting confidence and affording a fine view upwards to the Cadair cliffs. So far so good and spirits were high but things turned sour as we reached the base of the dense boulder field: the path effectively disappeared and we searched for any sign of a way forward.

Finding mere traces of a walked line we set off into the rock field, a very slow and laborious effort with hints of previous attempts luring us on, even a tiny cairn perched on a large boulder, but the situation eventually became so fatiguing and desperate we had to get out of these skewed boulders. We scanned the rock field and headed on the most feasible line towards the nearest vegetation we could see, finally reaching the comfort of heather and whinberry. Recuperating and climbing the slope for just a few minutes, an excellent path appeared from below: in hindsight, I think the original path descended and swung left far more than expected to circumnavigate the boulder field and we somehow missed it.

A short while later we met one walker descending the path, the only other person we would see in this area, and soon reached the now deserted Llyn y Gadair corrie, a magnificent sight that erased the boulder troubles in an instant. The infamous Fox's scree route to the Cadair summit is clearly seen across the water, I believe the rocky rib to its left is now the usual option.

Cadair cliffs & boulder field
Cadair cliffs & boulder field (15 May 2025__14:48:30)
Llyn y Gadair
Llyn y Gadair (15 May 2025__16:40:44)
Northern end of Llyn y Gadair & Fox scree path
Northern end of Llyn y Gadair & Fox scree path (15 May 2025__16:47:11)
Northern pool in Cadair corrie
Northern pool in Cadair corrie (15 May 2025__16:51:12)

We would have liked more time to explore this superb scene, but the boulder field had delayed us a lot and we needed to start the descent towards Llyn Gafr. Like Llyn y Gadair, Llyn Gafr had seemed to be a natural magnet for campers but as it came into view, it became clear that both lake areas were totally deserted. It was an easy decision to pitch right by the lake, an excellent location indeed.

Relaxing and recovering by the water, we saw a pair of Canada Geese who started honking and a pair of mallards whose brood of ten ducklings suddenly appeared from the camouflage of the shoreline rocks.

Pitch at Llyn Gafr
Pitch at Llyn Gafr (15 May 2025__18:33:55)

Day 3 - Fox's path & Nant y Ceunant

The geese and sheep ensured we didn't oversleep, not that there was any hurry to leave this fantastic pitch in the low early light.

We broke camp and crossed to the eastern side of the outflow to continue the descent of the Fox's path, the Rhinogydd sharply defined in the distance and the outflow meandering down to the wet plains below.

Early light at Llyn Gafr pitch
Early light at Llyn Gafr pitch (16 May 2025__06:27:38)
Early light on the outflow and Rhinogydd
Early light on the outflow and Rhinogydd (16 May 2025__06:57:28)
View over the Llyn Gafr outflow and lower slopes
View over the Llyn Gafr outflow and lower slopes (16 May 2025__07:09:36)

Nearing the lane by the Gwernan Lake hotel, the main footpath drops directly to the minor road but we took a right fork in the path through a fine woodland that slants down to join the road farther east. We walked north-eastwards to the point where the road crosses the Nant y Ceunant and followed the riverside footpath that becomes an excellent grassy track down to the upper roads of Dolgellau.