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 basis to either assert or deny it. Idwal's name appears in the "Dialogue between Myrddin and his sister Gwenddydd" (), a Middle Welsh vaticinatory poem whose text is preserved in two medieval Welsh manuscripts, Peniarth 3 (c. 1300) and the Red Book of Hergest (c. 1380-1410). In the text's question-answer form, a succession of "future" kings is prophesied, with Idwal among them. This succession agrees with the historical genealogies from father to son, but does not agree with the known royal succession. Idwal Iwrch Idwal Iwrch (), or Idwal ap Cadwaladr (), is a figure in the genealogies of the