Lakes & lochs in PowysPowys, Wales

Long reservoir in the hills above Llanidloes, held back by Britain's tallest concrete buttress dam of its era.

The lowest Elan Valley reservoir, its dam designed to spill in a sheet across the full width of the valley.

Small glacial tarn in a cwm below Corn Du, wrapped in fairy-lake folklore.

Large reservoir in a wooded valley with a lakeside path and good birdwatching, stocked with brown trout.

The higher of the two glacial waters under the Carmarthen Fans, beneath the eastern scarp of Fan Brycheiniog.

The highest and largest of the Elan Valley reservoirs, its long dam holding back water for Birmingham in the Cambrian hills.

Powys

Built to slake the thirst of Liverpool, this Berwyn-hills reservoir is marked by its Gothic straining tower and long stone dam.

Powys

South Wales's largest natural lake, holding a rare early-medieval crannog in the foothills of the Brecon Beacons.