Aberglaslyn, Llyn Dinas and Cwm Bychan walk

Walking trail

Along this route you'll take in the spectacular Aberglaslyn gorge with the Glaslyn river raging alongside the path, Bedd y Ci (the grave of Prince Llywelyn's faithful hound), the beautiful village of Beddgelert, the placid waters of Llyn Dinas and the old copper mine workings of Sygun and Cwm Bychan.


Aberglaslyn, Llyn Dinas and Cwm Bychan trail map


National Trust car park, Nantmor, grid ref: SH597462


From the car park, go through a gate near the toilet block and turn left for Aberglaslyn. Walk up through the woods, when you reach the river turn right to follow it upstream. This fisherman's path will take you along the side of the Aberglaslyn gorge. Great care should be taken when negotiating this part of the path, especially the stone buttress above the river. Continue until you reach the railway tracks and take care when crossing: the Welsh Highland Railway service travels between Caernarfon and Porthmadog along this route. Cross the railway line and turn left onto the bridge to cross the river, then turn right towards Beddgelert and continue upstream.

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Walkers on the Aberglaslyn Pass in Beddgelert


Don't miss the detour on the left to see Gelert's Grave and see if you can spot the special bronze sculpture of Gelert nearby.

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Gelert's stone monument in Beddgelert


At Beddgelert head right over a footbridge then left, following the river upstream, cross a street and go through a gate.


At the next gate, turn right onto a narrow lane, follow this past Sygun Copper mine. At the river, turn right to follow the path upstream towards the lake.

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Glaslyn river and Moel Siabod in the distance


By the lake shore (Llyn Dinas) turn right up a stone-pitched footpath that zig-zags up the hill. At the top continue for half a mile (ignore the first path on the right) at the fork, bear right.

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From Bwlch y Sygun take the left path (heading south) then bear right, down Cwm Bychan to the car park.

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Cwm Bychan ropeway, Beddgelert, Wales.


Nantmor car park, grid ref: SH597462

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Aberglaslyn, Llyn Dinas and Cwm Bychan walk


The path is steep in places and it's strongly advised that you keep to the path as the area is dotted with tunnels, spoil heaps and pits. Dogs are welcome but please keep on lead.

Aberglaslyn, Llyn Dinas and Cwm Bychan walk

Contact us

Aberglaslyn, Llyn Dinas and Cwm Bychan walk

How to get here

National Trust car park, Nantmor, grid ref: SH597462.
By train
By train: Nearest train stations at Penrhundeudraeth 4.5 miles (7.2km), Porthmadog 5 miles (8km) and Rhyd Ddu 6 miles (9.5km)
By road

By car: Post code is LL55 4YG but please note that sat nav will not take you direct to the car park, but onto a B road 0.6 miles away at Nantmor village. 

From Beddgelert:Follow the A498 towards Porthmadog. After approximately 1 mile (1.6km) turn left over the River Glaslyn onto the A4085 signposted Penrhyndeudraeth. After about 0.2 miles turn left up into the car park.  

From Penrhyndeudraeth: Follow the A4085 signposted Beddgelert for approximately 6 miles (9.5km). After Nantmor village turn right into the car park. 

From Porthmadog: Follow A487 towards Caernarfon for approximately 6 miles (9.5km). Turn right over the Glaslyn River onto A4085 signposted Penrhyndeudraeth. After about 0.2 miles turn left up into the car park. 

By bus

By bus: Bus stop at Nantmor and Beddgelert, check Traveline Cymru. Snowdon Sherpa stop at Aberglaslyn bridge and Beddgelert.

By bicycle

By Cycle: Cycle route number 8 is in the area, not leading to Craflwyn or Beddgelert directly, so follow on-road routes (which can be busy at times)

Aberglaslyn, Llyn Dinas and Cwm Bychan walk

Facilities and access

  • Car parking - National Trust car park at Aberglaslyn in Nantmor.
  • Toilets - in car park at Nantmor
  • Dogs are welcome in Snowdonia in general, but please keep them under control, especially around livestock