The beautiful Lynnau Cregennen (Cregennan Lakes) lie on an upland plateau above the Mawddach Estuary and beneath the cliffs of Tyrrau Mawr. Our walk today climbs up from the village Arthog to visit the lakes and the surrounding countryside. We start briefly along the main road before turning on to a footpath towards the Mawddach Trail. We follow the trail for a while, soon turning back towards a small church. Here we cross the road to join a footpath climbing steeply up beside the pretty Arthog Waterfalls. Emerging from the top of the gorge, we cross a small stream via an ancient clapper bridge and pass the site of Llys Bradwen, once home to Ednowain who was leader of one of the 15 tribes of Wales. We continue along field paths to reach, and then make a circuit of, the lakes. After a stretch along a quiet lane, a descent through a steep, wooded gully brigs us back to the start.