Craig y Llyn, Mountain summit in Neath Port Talbot County Borough, Wales.
Craig y Llyn is a mountain summit reaching about 600 meters with steep northern cliffs that drop down to glacial lakes. It marks the highest point of the southern Welsh coalfield plateau.
The mountain historically served as a natural boundary marker in the region of Glamorgan. It now stands between the modern districts of Neath Port Talbot and Rhondda Cynon Taf.
The name comes from Welsh and means rock of the lake, reflecting how geographical features were traditionally named in the region.
Visitors can reach the summit via several walking routes, including the Coed Morgannwg Way trail. Treherbert railway station nearby offers regular service to connect with other areas.
The northern slopes hold two glacial lakes named Llyn Fach and Llyn Fawr, formed during the last ice age. These are the southernmost tarns of their kind in Britain and offer a rare glimpse into the region's frozen past.
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