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Cwm Caseg is a broad glacial valley in Snowdonia leading west from the Carneddau towards Bethesda. It is borded by Carnedd Llewelyn to the southeast, Yr Elen to the west, and Foel Grach to the northeast. It contains a small lake, Ffynnon Caseg.
References
Cwm Caseg Wikipedia(Text) CC BY-SA