Aran Fawddwy at 2970 feet is the highest mountain in southern Snowdonia. On a clear day the views from the summit extend to Cader Idris, which is 43 feet lower, Snowdon, the Berwyn and Plynlimon. Most walkers start out from the car park in Cwm Cywarch and ascend via Hengwm and Drws Bach, from where there are good views of Creiglyn Dyfi lying below the crags of Aran Fawddwy. The lake is the source of Afon Dyfi, a lovely river that meanders for thirty miles to the sea at Aberdyfi.