Melin Trefin Mill Ruins – Porthgain Harbour loop from Carreg Samson

Hiking trails & Routes

Melin Trefin Mill Ruins – Porthgain Harbour loop from Carreg Samson

Moderate

5.0

(8)

hikers

Melin Trefin Mill Ruins – Porthgain Harbour loop from Carreg Samson

03:44

13.4km

240m

Hiking

Moderate hike. Good fitness required. Easily-accessible paths. Suitable for all skill levels. The starting point of the route is right next to a parking lot.

Last updated: August 21, 2026

Tips

Your route passes through protected areas

Please check local regulations for:

Pembrokeshire Coast National Park

Waypoints

Start point

Parking

Get Directions

404 m

Viewpoint Over Abercastle

Highlight • Viewpoint

Lovely views of the small bay of Abercastle. Well worth a visit if you're already here to admire the dolmen.

Translated by Google •

Tip by

2.70 km

Pwll Olfa Bay

Highlight • Natural

Pwll Olfa is a bay which can display the most beautiful aquamarine waters, when the weather and sea conditions are permitting.

Tip by

3.58 km

The slate quarry itself was beyond the cliff edge, north of the buildings. There was also an inland pit to the east, along with a short length of railway track running between the cliff and quarry buildings.

Tip by

4.07 km

Melin Trefin Mill Ruins

Highlight • Historical Site

Thought to date from the 15th century, the ruins of Aberfelin Mill are a vestige of the region's industrial past. The mill was used to grind wheat and barley and …

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4.42 km

Llwynog Arian Stone Circle

Highlight • Monument

There are a few stories about the origins of Llwynog Arian Stone Circle. It's not typical, having only 11 stones instead of 12. Accordingly legend has it that the 12th …

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6.46 km

Porthgain Harbour

Highlight • Settlement

Porthgain is a treat to visit. Once a small commercial harbour used for exporting stone from the nearby quarry, it now offers visitors a great pub, a super cafe/restaurant and …

Tip by

6.78 km

View of Porthgain and the White Tower

Highlight • Viewpoint

Just a short walk along the costal path up from Porthgain and you get a lovely view along the coast and back into Porthgain

Tip by

9.28 km

Melin Trefin to Abercastle Coastal Walk

Highlight (Segment) • Trail

13.4 km

End point

Parking

Way Types & Surfaces

Way Types

8.00 km

4.38 km

524 m

348 m

185 m

Surfaces

7.97 km

4.40 km

653 m

317 m

< 100 m

Elevation

Nothing selected – click and drag below to see the stats for a specific part of the route.

Weather

Tuesday 6 October

13°C

9°C

56 %

Additional weather tips

Max wind speed: 32.0 km/h

to get more detailed weather forecasts along your route

Comments

August 14, 2022,Porth Gain - Trevin - Abercastell Figure of 8

Starts and ends in Porth Gain. Parking is relatively easy, and there's an EV charger down at the harbourside. The two sectors of the Pembrokshire Coast path are rugged and relatively quiet. The inland path from Porth Gain to Trefin is easy, broad and offers good views too. Beers, fish dinners and icecreams to end, either at The Sloop Inn …