Ring of Gullion Area of Outstanding Natural Beauty

The Ring of Gullion is a proper geological marvel - a 5-mile circuit of volcanic hills that crater inward toward a brooding central mountain. It's the kind of landscape that makes you understand why people write poetry about Ulster. You're looking at ancient basalt rings formed roughly 60 million years ago, and from up here the countryside rolls out in every direction like someone's thrown a green blanket over the land.

Walkers will get the most from this. There's a circular trail that takes you round the rim, and it's not a casual stroll - expect proper climbs and steady descents, but the views across County Armagh and into County Louth reward the effort. On a clear day you can see for miles. The central lake, Callan Lough, sits like a dark mirror at the bottom, and various folklore insists it's bottomless. It's not, but the mystery adds to the pull of the place.

Bring sturdy boots and check the weather before you head out. Summer's obviously the safer bet, though winter light on the hills has its own appeal. Allow three to four hours for the full circuit if you're not rushing. It's free to explore, which is just how these things should be.

If you're based at somewhere like Hilltop Hideaway nearby, this becomes your morning adventure - a proper leg-stretcher before settling in with a hot tub later. The Ring sits just south of Newry, making it easy to reach from the town centre.