Lake of the Greycheek — sometimes called Lake Australia for its outline on the map — in a high Glyderau cwm below Tryfan and Glyder Fach, five hundred and fifty-five metres up. Four hectares with weedy margins and no clear path round it, holding hard-fighting wild brown trout to half a pound. Forty minutes' walk from the Ogwen Cottage car park; popular with walkers, less so with anglers.
- Lake
- Ordovician volcanics

