Tre'r Ceiri Hillfort Walk

This walk climbs to the remarkable Iron Age hillfort of Tre’r Ceiri on the Llŷn Peninsula in Wales. Starting from the Yr Eifl car park near the village of Llithfaen, it’s around 1.5 miles each way, with a steady climb that requires a reasonable level of fitness.
From the car park, footpaths lead north east towards the hillfort, which occupies a lofty position on the slopes of Yr Eifl, around 450 metres above sea level.... Dating from the Iron Age, the settlement is thought to have been established more than 2,000 years ago. It’s one of the best-preserved hillforts in Britain, with substantial stone ramparts and the remains of around 150 roundhouses and other buildings still visible within its walls.
Take time to explore the ancient settlement and imagine what life must have been like here, high above the surrounding countryside. The elevated position also brings wonderful views across the Llŷn Peninsula, the mountains of Eryri and the coastline, with Cardigan Bay stretching away in the distance. The walk is around 3 miles there and back, making it a rewarding short outing with a fascinating historical destination.
Walk Report November 2nd 2026 By Gareth Williams:
We had a bit of a mixed day weather-wise, with some brighter spells at first before the cloud started drifting across the higher ground. It was noticeably cooler and breezier as we climbed, so we were glad to have an extra layer with us. The views were already opening up behind us, with the Llŷn countryside and coastline looking wonderful in the changing light. We also spotted a couple of choughs flying around the rocky slopes, their distinctive red bills and legs making them easy to recognise.
The climb certainly got the heart going, and I have to say it felt a little more demanding than the short distance might suggest. The path is rocky underfoot in places, and there are some uneven sections as you get closer to the fort. We stopped a few times to catch our breath, which was no hardship with scenery like this to look back at.
Arriving at Tre’r Ceiri was quite something. The first thing that struck me was just how much of the settlement has survived. The massive stone walls are still standing in places, and once inside there are roundhouse remains scattered across the summit. It’s fascinating wandering between them and trying to picture this as a busy community rather than the quiet, windswept place it is today. Some of the stones have lovely patches of coloured lichen too, which really stand out against the grey rock.
We spent quite a while exploring the different parts of the fort. The scale of the place is impressive, especially when you remember that around 150 houses and other structures have been identified here. The position is extraordinary as well. Even with the cloud moving across the hills, we could see a huge sweep of the surrounding countryside and coastline, and there were moments when the views seemed to stretch on for miles.
By the time we headed back down, we were more than ready for a rest, but it was one of those short walks that leaves you feeling you've had a proper day out. The combination of the climb, the wild hilltop setting and the remarkably well-preserved remains makes Tre’r Ceiri a very special place to visit.
The fort sits on the slopes of Yr Eifl so you could continue your walk by heading west from the fort to climb to the adjacent summit.
Postcode: LL53 6NU
Pubs and More Info
The excellent Caffi Meinir is located a short distance from the car park. The cafe is in a wonderful location, overlooking the beautiful coastline of the area. You can sit outside and enjoy your meal with wonderful views over Porth Y Nant. You can find the cafe at Nant Gwrtheyrn, Llithfaen with a postcode of LL53 6NL for your sat navs. The site also includes a Welsh language school and museum where you can find out about the fascinating history of the area.
Near Yr Eifl there's the Trefor Quarry to visit. There's some good footpaths around the unusual quarry landscape with more fine coastal views from the elevated position of the site. You can also visit the photogenic rock formations at the Trefor Sea Stacks to see in this area.
To further continue your walking in the area you could pick up the Llyn Coastal Path from near the car park. If you follow it south west it will take you to the lovely beaches at Nefyn and Porthdinllaen.
If you head a few miles to the south you'll come to the southern side of the peninsula where you can visit the coastal settlements of Pwllheli, Llanbedrog and Abersoch.
The Garn Boduan Walk starts from nearby Nefyn. It will take you up to the viewpoint and Iron Age Hill fort located just south of the settlement.
Head inland and there's climb to the remote Garn Fadryn. There's an Iron Age Hillfort and some incredible views from the top of this peaceful hill.

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Yr Eifl Llyn Coastal Path Porthdinllaen Garn Fadryn Nant Gwrtheyrn Trefor Sea Stacks

Photos

Llanaelhaearn: towards Tre'r Ceiri. The fort is probably the best preserved hillfort in Wales and Britain and was occupied during the Roman era. Within its 13 feet high, 15 feet thick walls, 150 huts provided a wild refuge from the pax romana. The Romans had a base at Caernarfon, 15 miles away, but Tre'r Ceir's height and steep approaches and maybe its remoteness meant that it was never slighted by their army. With the departure of the Romans it was abandoned.

Main entrance. This narrow passage through the main rampart was reached via a path uphill from an outer entrance through a second wall; the path running under the rampart. Tre’r Ceiri stands at 485m, one of the highest hillforts in Britain and probably dates from the years immediately preceding the Roman invasion of Wales in AD 78. It appears to have been abandoned after the Romans left Wales.

Taken in the ancient iron age fort on top of the westernmost peak of Yr Eifl, this photo shows the entrance of the fort with the Welsh mountains in the background

Hut circles. The remains of some 150 huts are contained within the Tre'r Ceiri Iron Age fort. During its period of occupation between about 150BCE and 400CE the inside of the fort would have been grass covered. The thick heather which now covers the site is a later invader.

 Caffi Meinir, the former Capel Seilo and the ruined Ty Hen The cafe, a modern development, is named after Meinir, an 18thC inhabitant who disappeared on the eve of her wedding and whose skeleton was eventually found. The former Calvinist chapel, Capel Seilo, is now the Welsh language centre. In the 19th century, Mass was also celebrated in the valley as many of the quarrymen were Irish immigrants who arrived here by ship. Ty Hen represents the older pre-industrial phase of farming and fishing. The cafe is a fine place to go for refreshments after your walk.

Eastwards over Tre'r Ceiri ramparts. The view eastwards from the hillfort summit, with the village of Llanaelhaearn below, miles of rolling countryside beyond and the outline of Moel Hebog [782m] on the horizon.

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