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
Llyn Idwal at the northwest edge of Llyn Idwal which is occasionally used by visitors for recreation, including bathing in the summer months. As a mountain lake, the waters can be cold and care should be taken by swimmers not to go out beyond their depths. The lake lies wholly within Gwynedd County, although the eastern edge forms the boundary between the counties of Gwynedd and Conwy. Llyn Idwal Llyn Idwal is a small lake (approximately 800 m by 300 m, or 28 acres) that lies within Cwm Idwal in the Glyderau mountains of Snowdonia. It is named after Prince Idwal Foel,