The mountain at the heart of the Ring
Slieve Gullion is the centrepiece of the Ring of Gullion, an Area of Outstanding Natural Beauty made by an ancient ring dyke — a near-circle of low hills wrapped around the central mountain, thought to have formed when a great volcanic system cooled deep underground and the softer rock around it wore away over the ages. At 573 metres it's the highest point in Co Armagh, and on a clear day the view from the top runs across South Armagh to the Mournes, Carlingford Lough and beyond.
On the summit sits a Neolithic passage tomb — thought to be around 5,000 years old, and reckoned to be the highest surviving passage tomb in Ireland. Beside it lies a small mountain lake, Calliagh Berra's Lough. Legend has it that the witch Calliagh Berra lured the giant-warrior Fionn Mac Cumhaill into these waters, and he climbed out an old man with white hair — and the folk tale still warns that anyone who bathes in the lough will find their hair turned white. Her "house" is said to be the ancient cairn at the very top.
Down in the sheltered woodland below, the forest park gave the old mountain a new life for families. The Giant's Lair story trail turned the myth into a walk children can step right into, the adventure playpark and Scenic Drive drew day-trippers, and the whole place became one of South Armagh's best-loved days out — a gentle forest and a real mountain, side by side, with a giant's legend running through the middle of it.