Lady of the Lake Mountain Dog Walk off the Trecastle Mountain Road

Llyn y Fan Fach (Welsh: 'lake of the small peak') is the smaller and more westerly of two natural lakes within the Black Mountain. It is enclosed within a rock hollow formed as a result of glacial action during the ice ages.

It is drained by the Afon Sawdde which cuts through a glacial moraine which in part forms a natural dam.

A small artificial dam was constructed in the 1930s to divert some of its waters to boost Llanelli's water supply.

Llyn y Fan Fach is associated with the Lady of the Lake legend.

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