Porthdinllaen marine walk on the Llyn Peninsula

Morfa Nefyn, Gwynedd

Route details and mapDownload as a print friendly PDF
Sandmartins' nest holes near Porthdinllaen © National Trust

Sandmartins' nest holes near Porthdinllaen

Tw Coch has been an inn for about 200 years © National Trust

Tw Coch has been an inn for about 200 years

Eel grass has become quite rare in this part of Britain © Dr Roger Herbert, Medina Valley Centre

Eel grass has become quite rare in this part of Britain

View towards Tw Coch Inn, Porthdinllaen © National Trust

View towards Tw Coch Inn, Porthdinllaen

Route overview

This walk will reward you with stunning views in all directions as you follow it along a splinter of land that's an outstanding wildlife haven.

Route details

See this step-by-step route marked on a map

Map showing the route of the Porthdinllaen marine walk on the Llwn Peninsula
  • Directions
  • Route
  • Bus stop
  • Parking
  • Toilet
  • Viewpoint

Start: Car park at Morfa Nefyn, grid ref: SH281406

  1. Head to the far end the car park, from where you'll have great views across the bay towards Pistyll and Trefor. A brick works stood on this site for 40 years; it closed in 1906. Carry on down to the beach. At low tide you can see the remains of the brick works' jetty.

  2. Turn left onto the sand and follow the beach for about half a mile (0.8km) until you reach some unfinished sea defences. These were built by the Matthews family, owners of the Cefn Amlwch Estate. The project came to a halt when war was declared in 1914.

  3. Continue along the sand until you reach a spit of land in the shoreline. This site was used for ship building in the 1830s and 40s, when the slate industry in Caernarfon was at its height.

    Show/HideSand martins

    Along section 3 of the walk, sand martins nest in holes in the cliff face between April and mid September.

    Sandmartins' nest holes near Porthdinllaen © National Trust
  4. Carry on around the headland towards the hamlet of Porthdinllaen and the distinctive Tw Coch Inn ('Red House' in English). Porthdinllaen was originally intended to be a major port, with Whitehall (the big building before the Tw Coch) as a hotel. The Tw Coch itself has been a popular inn for almost two centuries.

    Show/HideTw Coch Inn

    During the late 19th and early 20th centuries the Tw Coch Inn was run by a landlady known as Mrs Jones. She used it as a small private school for girls. She also worked as the harbour master at Porthdinllaen and still had time to raise six children.

    Tw Coch has been an inn for about 200 years © National Trust
  5. As you walk in front of the Tw Coch look along the tideline for eel grass washed up onto the beach.

    Show/HideEel grass

    The marine eel grass - you can spot it in section 5 of the walk - has become much less common in the North Atlantic over the last 70 years. Eel grass is very useful in providing habitats and food for numerous fish, crabs and scallops.

    Eel grass has become quite rare in this part of Britain © Dr Roger Herbert, Medina Valley Centre
  6. Carry on past Caban Griff (a small information point) along the footpath leading across the rocks. Check out the rock pools as you go, and keep an eye out for grey seals, which fish along this stretch of coastline.

  7. Go up the steep slope past the lifeboat station onto the golf course. There's a fantastic view across the bay at this point.

    Show/Hide View across the bay

    From here you can look back over the whole sweep of the bay.

    View towards Tw Coch Inn, Porthdinllaen © National Trust
  8. Follow the track back over the golf course towards the mainland. When you reach the club house, carry on through the golf course car park back towards Morfa Nefyn. Turn left into the National Trust car park where you started the walk.

End: Car park at Morfa Nefyn, grid ref: SH281406

  • Trail: Walking
  • Grade: Moderate
  • Distance: 2.5 miles (4km)
  • Time: 1 hour
  • OS Map: Landranger 253
  • Terrain:

    Steep in places, steps, some uneven parts of the coastal path. Dogs on leads are welcome.

  • How to get here:

    By bike: NCN Route 41 goes close by, see Sustrans website for details

    By bus: Pwllheli to Tudweiliog route goes to Morfa Nefyn, see Traveline-Cymru website for details

    By train: Nearest station Pwllheli, 15.5 miles (25km), see Traveline-Cymru website for details

    By car: A497 Pwllheli - Nefyn then B4412 signposted Morfa Nefyn. Follow signs to golf course; car park on the right. Post code for Sat Navs: LL53 6DA

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