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 ap Meurig with an army of Danish mercenaries and laid waste the country; his object was to seize the fugitive Idwal, but in this he was unsuccessful. By the year 995 the sons of Meurig gathered a sufficient following to return to North Wales, and, by defeating Maredudd at the battle of Llangwm, Idwal at last succeeded to the sovereignty. But the Danes had overrun the country during Maredudd's reign: the churches had been spoiled, the people were demoralised, and there was a great scarcity of food. Idwal is eulogised in the "Gwentian Chronicle" for his bravery and statesmanship in attempting to