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 the Welsh oak. Birch, ash, mountain-ash and hazel are also common. The park also contains some large (planted) coniferous forested areas such as Gwydir Forest near Betws-y-Coed, although some areas, once harvested, are now increasingly being allowed to regrow naturally. Northern Snowdonia is the only place in Britain where the Snowdon lily ("Gagea serotina"), an arctic–alpine plant, and the rainbow-coloured Snowdon beetle ("Chrysolina cerealis") are found, and the only place in the world where the Snowdonia hawkweed "Hieracium snowdoniense" grows. A large proportion of the park is today under designation (or under consideration for designation) as Sites of Special Scientific