GPS Cycle and Walking Routes

Treginnis Peninsula and Porthclais

6 miles (9.5 km)

This circular walk explores the beautiful coastline and fascinating geological features of the Treginnis Peninsula in the Pembrokeshire National Park. You will pass the oldest volcanic rocks in Wales, formed over 600 million years ago. It's a particularly beautiful stretch of coast with wonderful views over to the nearby Ramsey Island. It's also a great area for wildlife watching. Look out for birds including Peregrine, Oystercatcher, Kittiwake and Shag. You may also see porpoises in the water below and deer on Ramsey Island.
The walk starts at the Porth Clais car park and follows country lanes towards Treginnis Lodge where there are super views towards Skomer Island and St Bride's Bay.
Just past Treginnis Lodge you turn right off the country lane at the sign for Pencnwc Farm, and head north towards Porthstinian/St Justinian. At St Justinian you will pass the RNLI station, the Grade I listed ruined chapel and the small harbour where you can catch boats to Ramsey Island.
At St Justinian you pick up the Pembrokeshire Coast Path and head south passing the Iron Age hillfort of Castell Heinif andSeal Bay where you can look out for seal pups in late summer and early autumn. You then head east along the coast passing Porthlysgi Bay with views of Skomer Island, Midland Isle and the Marloes Peninsula in the distance.
Finally you pass around the pretty Porthclais Harbour before returning to the car park. It's a lovely area with wild horses and stunning coastal views while in the summer many of the coastal fields are covered with pretty heather.


SA62 6RR - Please note: Postcode may be approximate for some rural locations

Treginnis Peninsula OS Map - Mobile GPS OS Map with Location tracking

Treginnis Peninsula Open Street Map - Mobile GPS Map with Location tracking

Further Information and Other Local Ideas

Head a few miles north and you could visit the wonderful St David's Head. The beautiful headland is considered one of the major highlights of the National Park with some splendid rock formations and views to Whitesands Bay. The Neolithic burial chamber of Coetan Arthur and the climb to Carn Llidi can also be started in this area.
To the east is the Solva to St David's Coastal Walk which will take you from the historic city to the stunning Solva Harbour.

Cycle Routes and Walking Routes Nearby


Porthclais, St David's - - 51345

Porthclais, St David's

Pembroke Coastal Path and Ramsey Island - - 1332797

Pembroke Coastal Path and Ramsey Island

Maen Bachau - - 1544596

Maen Bachau

Azure seas - - 1185990

Azure seas

A reminder of the past, Porthclais - - 1525210

A reminder of the past, Porthclais This fine mooring bollard is a reminder that Porthclais harbour was once a busy trading port serving the city of St Davids, a mile to the northeast. From the sixteenth century until around 1900, goods handled at Porthclais included wool, corn, malt, timber and lime. The derelict lime kilns can still be seen on both sides of Porthclais harbour. Limestone was brought in by ship and burnt in the kilns to produce lime which was transported away by horse and cart; some went to make mortar but most was used for agricultural soil conditioning.

Harbour entrance at Porthclais - - 1525244

Harbour entrance at Porthclais Porthclais harbour is maintained by the National Trust which runs a sales kiosk and tea stall in the carpark making it a popular destination for walkers. Porthclais harbour is at the head of a narrow inlet, a ria formed when seawater flooded the valley which had been carved out by retreating glaciation after the last ice age. A stone breakwater protects the harbour entrance. The coast around Porthclais is popular with canoeists and rock-climbers.

Ivy-covered limekilns at Porthclais harbour - - 1525223

Ivy-covered limekilns at Porthclais harbour

Porthlysgi Bay - - 3661525

Porthlysgi Bay. This secluded beach is only accessible from the Coastal Path about 1 mile west of Porthclais. There's golden sands, rock pools and clear blue waters here.


GPS Files

GPX File

Treginnis Peninsula.gpx (On Desktop:Right Click>Save As. On Ipad/Iphone:Click and hold>Download Linked File)

Memory Map Route

Treginnis Peninsula.mmo (On Desktop:Right Click>Save As. On Ipad/Iphone:Click and hold >Download Linked File)