53°10′47″N 4°03′04″W / 53.1797180000°N 4.0512150000°W
Cwm Caseg is a broad glacial valley in Snowdonia leading west from the Carneddau towards Bethesda. It is bordered by Carnedd Llewelyn to the southeast, Yr Elen to the west, and Foel Grach to the northeast. It contains a small lake, Ffynnon Caseg.[1]
- ^ Pearce, Horace. In the Tracks of Old Welsh Glaciers. The Dublin University Magazine, Volume 84, 1874