Gwynllyn

The water sits perfectly still on the right morning, reflecting the hills that slope down from the moorland above Rhayader. Gwynllyn is a small reservoir - nothing fancy, nothing screaming for attention - but it's the kind of place you stumble upon when you're exploring the Elan Valley proper and fancy a quieter spin.

What you get is a straightforward walk round the water's edge, decent views across to the surrounding hills, and the sort of peace that proper Welsh countryside delivers. The lake itself isn't deep drama - it's more about the walk than the destination, really. Families with younger kids might manage an hour here without grumbling, though honestly the nearby Elan Valley reservoirs (bigger, more established, better facilities) probably edge it out if you've got restless types in tow.

The closest base is Rhayader town, which sits just 1.3 miles from Wyeside Caravan & Camping Park - your best bet for a proper base. Elan Oaks is equally close and gets perfect ratings if you want something slightly more upmarket. Both are well-positioned for exploring the wider water systems in the valley.

Go in autumn or early spring when the light's interesting and the crowds are nonexistent. Worth the detour if you're already in the Elan Valley, but don't drive out specially - there are better waters nearby. The walk itself demands no serious fitness, and you won't need more than two hours unless you're dawdling with a camera.