Cromhall Quarry

The water at Cromhall Quarry hits you first - that impossible turquoise that makes you squint and reach for your phone camera before you've even properly arrived. It's a flooded quarry near Wotton-under-Edge, and what was once an industrial scar has become something rather special for swimming, fishing, and just sitting about on a decent afternoon.

This is proper cold-water territory. The quarry's deep, which means summer swimmers should come prepared - it's refreshing rather than warm, even in July. If you're not planning a dip, the walk around the edge is straightforward enough, and the views across the water back towards the Cotswolds rim are genuinely worth the trip. Bring a picnic. Bring binoculars if you're into birds.

Historically-minded visitors might find it interesting enough - the quarrying scars are still visible on the rock faces - but this isn't a place you'd come for history lessons. It's about the landscape itself and what nature does when we stop digging. Families with young children should know it's not supervised, so you'll need to watch them carefully near the water's edge.

Allow an hour for a leisurely walk and a sit-down, longer if you're swimming. Pepper Pot Caravan Park sits just 2.6 miles away, making this an easy morning outing if you're staying locally. It's free, as far as anyone can tell, and there's no formal opening hours - just go when daylight allows.