Llyn Idwal into Llyn Idwal from around Cwm Idwal. One small river flows out and joins the Afon Ogwen river at Pont Pen-y-Benglog near Ogwen Cottage, immediately above the Rhaeadr Ogwen waterfall. The lake is easily accessible on foot via a 900-metre long stone-paved path from Ogwen Cottage on the main A5 road. Another path encircles the lake. Two paths lead from opposite sides of the lake to the top of the ridge close to the Twll Du (Devil's Kitchen), but these paths become rather steep in places. They lead to Glyder Fach and Glyder Fawr. There is a small pebble beach
Craig Cwm Amarch the Pencoed ridge. Mountain slopes in Wales are commonly named after the farms to whom the grazing belonged, hence Mynydd Pencoed is named after the farm (its buildings now derelict) at its western foot. Craig Cwm Amarch Craig Cwm Amarch is not synonymous with Craig y Cau but names the headwall of Cwm Amarch on Cadair Idris in the Snowdonia National Park, in Gwynedd, north-west Wales. There seems to be some confusion over naming by people who are not local. 'Craig Cwm Amarch' refers to the crags heading Cwm Amarch, which impinge from the south into the ridge of Mynydd