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 ENE up the lake, with the hills of Carn Owen (L) and Drosgol (R) in the background. Product number 0811113. Email me to enquire about this image: click HERE.