The hill of Yr Eifl, on the Lleyn Peninsular, has three summits; Carn For (444 metres), Garn Ganol (564 metres); and Tre’r Ceiri (485 metres). This walk will visit all three, enjoying wonderful views (weather permitting) and a taste of history. We start by heading up to Bwlch yr Eifl, the pass between Garn For and Garn Ganol. From here it is only a short climb to the summit of Garn For, which has spectacular views over Caernarfon Bay and the Trefor granite quarry. Retracing our steps to the bwlch, our next destination is Garn Ganol, the highest point of our route and another great viewpoint. Continuing over the summit we now head quite steeply down, crossing a flatter area before making our final, short ascent on to Tre’r Ceiri, the name being a corruption of Tre’r Cewri, Town of the Giants. Here we encounter the remains of a substantial Iron Age hillfort with huge stone walls and clusters of hut circles, one of the best preserved examples of its kind in Britain. Leaving the fort behind us, a gentle descent around the base of Yr Eifl brings us back to the start.