The Llŷn doesn’t get the walking reputation Snowdonia does, twenty minutes up the road — which is strange, because Yr Eifl (The Rivals), the trio of dramatic peaks on the peninsula’s north coast near Trefor and Llithfaen, offers some of the best short, rewarding hillwalking in North Wales.
The main event is Tre’r Ceiri — “town of the giants” — one of the best-preserved Iron Age hillforts in Britain, perched near the summit of the eastern peak with the stone footings of around 150 hut circles still visible inside its ramparts. It’s a genuinely remarkable site: a 2,000-year-old hilltop town, still standing, with views on a clear day stretching across the whole peninsula to Snowdon in one direction and Ireland in the other. The walk up from the Nant Gwrtheyrn road is steep but short — well within reach of a reasonably fit family for a half-day out.
Nant Gwrtheyrn itself, the old quarrying village tucked into a steep valley beneath Yr Eifl, is worth building into the same day: now home to the National Welsh Language and Heritage Centre, it’s a striking, slightly hidden place with its own small shoreline and café, reached by a famously steep road down from the ridge.
For longer legs, the Wales Coast Path runs the entire length of the Llŷn’s shoreline, and sections around Yr Eifl, Nefyn, and the far western tip near Aberdaron and Mynydd Mawr offer some of the most dramatic coastal walking in Wales — cliff-edge paths, sea views in three directions, and none of the queues you’d find on an equivalent stretch of the Pembrokeshire coast.
Tre’r Ceiri itself is worth the climb on its own merits, quite apart from the views: it’s regarded as one of the best-preserved Iron Age hillforts in Britain, with the stone footings of dozens of hut circles still visible inside its ramparts, some standing chest-high nearly two and a half thousand years after they were built. None of the three peaks here are technical climbs, but they are proper hill walking rather than a coastal stroll — sturdy footwear, a map (digital or paper) and a realistic sense of the weather matter more here than anywhere else on this list, since cloud can drop onto the ridge with little warning even when Nefyn seafront is still in sunshine. Allow two to three hours for Tre’r Ceiri alone, more if attempting all three summits in one day, and always tell someone your planned route before setting off on an exposed hillside walk like this one.
This is a trail best pitched at visitors staying a few days rather than a single afternoon — pair a Tre’r Ceiri morning with an easier coastal stretch the next day, using llyn.live’s Walks & Nature filter to plan routes, and its live conditions data to check the weather on Yr Eifl before committing, since the exposed ridge is a different prospect in wind and low cloud than on a still summer morning.
Photo: Tre’r Ceiri hillfort, Yr Eifl — public domain, via Wikimedia Commons.