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Llyn Perfeddau is a small lake in the Rhinogydd range at a height of 1530 feet, east of Llanbedr. There are some places to park on the lane up from Llanbedr, probably the best is at Grid ref : SH622261. From here, a road leads to Graig-isaf from where a footpath (track) continues eastwards, passing the remnants of old manganese mines. The lake itself is often in the shadow of Y Llethr peak on the southern side.