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
Idwal Iwrch genealogies such as those from Jesus College MS. 20 (as the father of "Rhodri Molwynog son of Idwal Iwrch son of Cadwaladr Fendigiad") and the Harleian genealogies (as the father of "Rotri son of Intguaul son of Catgualart"). John Davies' "History of Wales" does not mention Idwal, while John Edward Lloyd's "History" says only that Idwal was Rhodri Molwynog's father. The King of Gwynedd during Idwal's lifetime is not known, and while he is one of the most likely candidates (because he was both the son of a king and the father of a king), there is no sufficiently reliable