Treffgarne Quarry Pond

The water at Treffgarne Quarry Pond sits eerily still, hemmed in by steep rocky walls that rise up like the sides of a giant's bathtub. What you're looking at is an old slate quarry that's been flooded - the kind of industrial heritage accident that's become rather lovely by accident. The pond itself is small enough that you can walk around it in twenty minutes, but the drama of those quarry faces makes it feel bigger than it is. Locals fish here, and there's a genuine sense that you've stumbled onto something real rather than something designed for visitors.

It's the sort of place that appeals to walkers passing through rather than a destination in itself. If you're staying at Three Fields Campsite or Brandy Brook - both excellent bases near Haverfordwest - and you fancy a leg-stretcher that's got a bit of geological interest, this delivers. The walk is dead easy, terrain's straightforward, and kids won't complain about the length. That said, don't expect facilities or a visitor centre. There's just water, rocks, and quiet.

The real value here is how it slots into a wider Pembrokeshire walk. Combine it with exploring Haverfordwest itself or head towards the Preseli Hills if you want something with more teeth. Free to visit, obviously - it's a quarry pond, not a theme park. Go on a clear day when the water reflects the sky properly. Murky weather and it loses half its appeal.