Dunseverick pool

The pool at Dunseverick sits right on the cliff edge where the land just drops away to the sea. It's a natural rock formation - basically a deep basin carved into the coastal rocks - and it fills with seawater when the tide comes in. Worth knowing upfront: this isn't a swimming pool you'll find on any map as a formal attraction. It's more of a geological curiosity that rewards a proper clifftop walk from Ballymoney direction.

The real appeal is the drama of the setting. You're standing on the Causeway Coast with water that shifts between emerald and slate grey depending on the light and tide. Walkers will find it genuinely rewarding - the approach itself is the main event, with views across to Portrush and beyond. History types might appreciate that Dunseverick was once a significant promontory fort, though there's not much visible evidence now beyond the landscape itself.

Time it with the tide if you want to see the pool properly filled. Low tide reveals the rocks in all their jagged glory but the pool drains. Allow a good couple of hours if you're walking from nearby, not just for the pool but for the coastal path either direction. The nearest proper base is Ballymoney, a tidy little market town a few miles inland, though Causeway Country Pods sits much closer and makes a sensible stop if you're doing a Causeway Coast loop. Free to visit, obviously - it's the cliffs. Best in clear weather when the views actually justify the trek.