The Plynlimon massif: Llyn Craig-y-Pistyll, now a source of drinking water but originally constructed to trap the headwaters of Afon Leri to supply water via an intricate leat-system to the waterwheels that drove pumps and other machinery at the many lead mines in the valleys beyond. View across the lake, with the hills of Banc Sychnant (L) and Carn Owen (R) beyond. Product number 081183. Email me to enquire about this image: click HERE.