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
Cwm Idwal the Cwm) in particular are popular with inexperienced climbers learning their skills. They were first climbed in 1897 by Rose and Moss. Twll Du has some excellent ice climbing during the winter. The Cwm is also popular for hill walking and scrambling, given its proximity to Tryfan and Glyder Fach and Glyder Fawr and their profusion of rocky ridges. In the mid-to-late 1950s and into the 1960s, this was the reunion excursion camp site of the first ascenders of Mount Everest and Kangchenjunga, held at Pen-y-Gwryd, many of whom were keen geologists and botanists. Cwm Idwal Cwm Idwal is a