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
Parc Cwm long cairn one of 17 in what is commonly known as Glamorgan. Severn-Cotswold cairns are the oldest surviving examples of architecture in Great Britain – Parc Cwm long cairn was built about 1,500 to 1,300 years before either Stonehenge or the Great Pyramid of Giza, Egypt was completed. The megalithic cromlech at Parc le Breos Cwm, known as Parc Cwm long cairn (), is a Severn-Cotswold type chambered tomb, built around 5850 BP (during the early Neolithic) in what is now known as Gower – about eight miles (13 km) west of Swansea, Wales, and about miles (2 km) north of the