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
Cwm, Blaenau Gwent Cwm, Blaenau Gwent Cwm () is a former coal mining village, community and electoral ward south of Ebbw Vale in the county borough of Blaenau Gwent, Wales, within the historic boundaries of Monmouthshire, United Kingdom. The name Cwm is thought to have derived from the farm on the present day nature reserve (Silent Valley), Cwm Merddog. Cwm is the Welsh word for valley and the name Merddog is believed to be a corruption of the name of the old farm that used to be here, Troed y Rhiw y Myrdd Fach, which translated means 'the foot of the myriad little