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
Snowdonia Marathon there has also been an annual Snowdonia Half Marathon, held in April, and mostly run on roads between Llanrwst, Trefriw and Betws-y-coed. Snowdonia Marathon The Snowdonia Marathon () was established in 1982 with the idea of being a dramatic alternative to the numerous city and town races that were becoming so popular. The route makes a circumnavigation of the Snowdon massif, starting and finishing at Llanberis. It is held annually in October. In a 2007 poll by "Runner's World" Magazine, the Snowdonia Marathon was voted the best marathon in the UK. A television highlights show is produced and aired by