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 such as tufted saxifrage ("Saxifraga cespitosa") and "Micranthes nivalis", can be found. It is also a home of the Snowdon lily, a plant which can only be found in the UK on Snowdon and its surroundings. Evan Roberts, the renowned botanist and explorer from Capel Curig, did probably as much as any other (self taught) botanist to document the area. The Snowdonia hawkweed, "Hieracium snowdoniense" is only known to occur in Cwm Idwal. Rhiwiau Caws (Idwal Slabs) and the cliffs around the head of Cwm Idwal are a popular area for rock climbing; Rhiwiau Caws (on the eastern side of