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
Gagea serotina alplily. For most of the year, the plant is visible only as long, curving, stiff, grass-like leaves, often protruding through cushions of other plants. The flowers appear from June onwards (despite the name "serotina", meaning "late-flowering"), and are borne at the end of long stalks. The flowers themselves are white, with purple or reddish veins along the tepals. In Great Britain, "G. serotina" is an ice age relict, only found on a few inaccessible sites in Snowdonia National Park, Cwm Idwal being one such site, and seems to have developed in isolation since the glacial period. Although the total Welsh