Tre'r Ceiri and Yr Eifl from the Llanaelhaearn road

The walk starts from the car park on the B4417 above Llanaelhaearn, at about 208 m. A short stretch of the road leads to the start of the path, which climbs the slope of Yr Eifl to Tre'r Ceiri, an Iron Age hill fort, 485 m, whose walls still stand up to 4 m high in places, with the remains of about 150 stone houses inside. A path goes on to the summit of Yr Eifl, Garn Ganol, 561 m, the highest point on Llŷn, with its cairn and trig point. The views run over Llŷn and Cardigan Bay and, on a clear day, to Ireland and the Isle of Man. The way down takes a different path to the road, with a short walk back to the car park.

It is 5.0 km with 391 m of ascent; allow about 2¾ hours. The grade is Moderate.

The path is steep and rocky in places and the top is exposed to wind and often in cloud: take a map and compass and wear boots. Stay on the path through the fort to protect the walls, and keep dogs under control: there are sheep on the hill. There is no pavement on the B4417 at either end of the walk.

The car park is on the B4417; no charge or fee is shown for it in OpenStreetMap. The village car park in Llanaelhaearn is 750 m away.

Route drawn by Global Adventurer along OpenStreetMap paths (© OpenStreetMap contributors, ODbL), with figures worked out from it. Check the forecast and the ground on the day: paths change.