Mourne Gullion Strangford Geopark

Overview

On 26 May 2023, the south-east corner of Northern Ireland became Ireland’s newest UNESCO Global Geopark, joining a small club of areas worldwide recognised for internationally significant geology. The Mourne Gullion Strangford Geopark unites three Areas of Outstanding Natural Beauty: the Mourne Mountains, the Ring of Gullion, and the Strangford and Lecale coast. It covers 1,932 km², of which 294 km² is sea, and its theme, ‘A Tale of Two Oceans’, tells 400 million years of Earth history: the closing of the old Iapetus Ocean and the birth of the North Atlantic. If you have one day and want the story at its clearest, spend it on the Ring of Gullion side, where the volcano is easiest to read in the landscape.

A landscape written in stone and legend

The geopark’s terrain works as a geological timeline. The Mourne granite records the collisions that closed the Iapetus Ocean. Over in County Armagh, the Ring of Gullion preserves the world’s first mapped ring-dyke, formed some 60 million years ago when magma pushed up into the surrounding rock and later eroded into a near-perfect circular ridge; the Camlough Fault has since shifted it by about 2 km. Between 27,000 and 23,000 years ago, glaciers carved the U-shaped valleys, dropped the drumlins and drowned coastal plains to form Strangford Lough, the largest sea inlet in Britain and Ireland.

Human history runs almost as deep. People moved in soon after the ice retreated, some 10,000 years ago, and the land holds more than 8,000 years of continuous occupation, including the remains of around 30 large stone tombs such as Ballymacdermot and the passage tomb at Clontygora. Early Christian sites like Killeavy Old Church and medieval strongholds including Greencastle and Dundrum mark later centuries. Myth is layered on top: the 50-tonne Cloughmore Stone above Rostrevor is said to have been thrown by Finn McCool, while Calliagh Berra’s Lough on Slieve Gullion carries its own old warnings.

Key geosites and walking routes

The geopark is built around a network of trails and geosites that make the science easy to reach.

• Mourne Way – A 40 km long-distance trail across the granite peaks, with summit views from Slieve Donard (850 m), the highest point in the geopark, and a start in the market town of Newcastle.
• Ring of Gullion Way – A loop climbing Slieve Gullion (573 m) past prehistoric cairns and the interpretive geological trail. The trailhead sits near Dromintee.
• Lecale Way – A coastal route along Strangford Lough, good for tracking migratory birds and watching boats work the tidal channels.
• St Patrick’s Way – A pilgrim path linking historic churches, tombs and rural lanes across the geopark.

Notable geosites include:

• Cloughmore (The Big Stone) – A massive glacial boulder perched above Rostrevor.
• Cailleach Berra’s House – The ancient passage tomb on the summit of Slieve Gullion, beside its sacred lake. See Slieve Gullion – Ancient Tomb and Sacred Lake.
• Murlough National Nature Reserve – Ancient sand dunes held by the National Trust, with a boardwalk through wildflower-rich grassland that supports 23 species of butterfly.
• Ballykeel Dolmen – A well-preserved portal tomb near Killeavy. More at Ballykeel Dolmen.
• Cranfield and Tyrella Beaches – Cranfield has wheelchair-friendly access and sensory play equipment; Tyrella runs a community dune-restoration project using native grasses.

Wildlife and conservation

The move from upland blanket bog to tidal wetland packs a lot of habitats into a small area. Peregrine falcons work the Mourne crags, while Strangford Lough holds wintering waders, salmon, sea trout and pollock. Conservation here is community-led and cross-border: recent work includes a €19.2 million cross-border peatland restoration programme to re-wet carbon-storing bogs, and three PEACEPLUS projects building climate resilience and coastal community involvement. Youth schemes like the Geopark Ambassador programme keep the next generation in the loop.

What to see and do

Forest parks and family outings

• Slieve Gullion Forest Park – Woodland trails, an adventure playpark and the children’s story route Fionn’s Giant Adventure.
• Castlewellan Forest Park – A Victorian castle, the vast Peace Maze hedge maze, mountain-bike trails and a nature-play area.
• Kilbroney Park – Riverside walks, the Narnia Trail and roomy picnic grounds.
• Delamont Country Park and Camlough Lake – Lakeside paths, angling and quiet picnic areas.

Water and adventure

• Kayaking and SUP on Strangford Lough – past seal colonies and drumlin islands, with guided sessions from local operators.
• Viking longship tours – replica vessels sail the Lecale coast with Norse-era stories.
• Coasteering and rock climbing – guided trips run from Portaferry, and the Mourne granite holds established routes for experienced climbers.
• Fishing – Strangford Lough is a recognised spot for salmon, sea trout and pollock, with licensed piers and seasonal boat trips.

Culture and heritage

• Distillery and gin tours – poitín at Killowen Distillery, or craft gin at Rademon Estate.
• Historic castles – Greencastle, Dundrum and Castlewellan run seasonal tours.
• Local festivals – the Ring of Gullion Lúnasa Festival brings traditional music, craft and food.

Visitor centres and practical information

Three main centres make good starting points:

• Mourne Mountains Visitor Centre (Newcastle) – displays, trail maps and a café, with free parking and accessible toilets.
• Slieve Gullion Visitor Centre (near Killeavy) – geological trail information, gift shop and exhibition space.
• Strangford Lough Visitor Centre (Portaferry) – marine ecology displays, café and accessible facilities.

One thing to budget for: parking now costs money at the two busiest forest parks, Kilbroney and Slieve Gullion, with charges applying from April. Only residents of the Newry, Mourne and Down Council area can apply for a free annual permit, so day-trippers from further afield should carry change or check the payment app. Opening hours vary by site and season. Most trailheads still park for free, dogs are welcome on most trails on a lead, and mountain weather changes fast, so carry waterproofs and a downloaded map before heading up.

Getting there and planning your visit

The geopark sits along the A1 corridor between Belfast and Dublin. By car, take the M1 to Newry, then the A25 to Newcastle for the Mourne side or the A2 to Portaferry for Strangford.

Public transport:

• Ulsterbus routes 86, 87 and 89 connect Belfast to Newcastle, Newry and surrounding villages.
• Rail – Newry station has regular services from Belfast and Dublin, with short taxi or bus links to the visitor centres.
• Cycling – the Mourne Way and Ring of Gullion Way suit road and gravel riders; bike hire is available in Newcastle and Newry.

Suggested itineraries:

• One-day family route: Start at the Mourne Mountains Visitor Centre, walk a gentle section of the Mourne Way, visit Kilbroney Park for the Narnia Trail, then finish on Cranfield Beach.
• Two-day geology focus: Day 1 covers the Ring of Gullion Way and geological trail, overnighting in Dromintee. Day 2 takes in the Murlough dunes, the Lecale Way and a SUP session on Strangford Lough.
• Three-day cultural loop: Combine Castlewellan Forest Park, a distillery visit at Killowen, a stretch of St Patrick’s Way and a tour of Greencastle or Dundrum.

Nearby stops include Ardress House, an 18th-century National Trust estate, and the Armagh County Museum and its regional archaeological collections. Book accommodation early for summer and festival weekends, and check trail conditions before you set out – the visitor centres hold the current route closures and weather alerts.