Overview
Sliabh Beagh (Irish: Sliabh Beatha) is a low-lying mountain plateau defined by sweeping blanket bogs, peat-clad hills and a chain of quiet upland lakes. Sitting directly on the historic border between County Monaghan and Northern Ireland’s Counties Fermanagh and Tyrone, the area feels remarkably remote despite its proximity to major roads. The highest summit, reaching roughly 384m, sits just inside County Fermanagh, while a subsidiary peak on the Fermanagh-Tyrone border marks the highest ground in Monaghan. Where these three counties converge lies the Three County Hollow, a flat, windswept depression that serves as a natural meeting point for walkers and a quiet landmark on the trail network.
The landscape is ecologically significant, designated as both a Special Area of Conservation and a Ramsar wetland. The complex mosaic of sphagnum mosses, ericoid dwarf-shrubs and shallow streams feeds directly into the Finn River, creating a habitat that supports some of Ireland’s most elusive upland birds.
History & Mythology
The plateau’s history is layered with pre-Christian legend and more recent, often turbulent, local events. The name Sliabh Beatha is commonly translated as “mountain of birch”, though folklore offers a different origin: the hill is named after Bith, a mythic figure said to be the son of Noah. Tradition holds that Bith was buried in a stone cairn at the summit, known today as the Cairn of Doocarn.
The area also carries the weight of Ireland’s penal era and the Catholic Emancipation struggle. Leacht a’tSagairt (the Priest’s Stone) is a mass-rock crowned by a large Celtic cross. It commemorates the 1754 shooting of a priest, traditionally identified as Fr McKenna, by a priest-hunter. Nearby, the Bragan Penal Cross marks the same martyrdom and honours the subsequent revenge raid carried out by the 17th-century outlaw Shane Barnagh (also recorded as Shane Bernagh), who used the rugged terrain to evade capture.
Further along the ridges, St Patrick’s Chair & Well sits above Altadaven Wood. The boulder-hewn seat and adjacent holy well predate Christian arrival and were likely a Druidic ritual site before being adopted into 7th-century Patrician tradition. In the early 2000s, the People’s Millennium Forests initiative planted native saplings in the Favour Royal Forest, restoring a fragment of the area’s once-vast woodlands and creating a thriving corridor for wildlife.
Walking the Trails
Sliabh Beagh is primarily a destination for walkers, offering routes that range from gentle family strolls to demanding multi-day treks. The crown jewel is the Sliabh Beagh Way, a 46km (28-mile) linear long-distance trail. Starting at St Patrick’s Chair in County Tyrone, the route crosses Lough More, climbs Bragan Mountain and finishes in Donagh, County Fermanagh. It is a serious undertaking, featuring sustained ascents, exposed peat-bog sections and uneven forest tracks. Most visitors complete it over two or three days, using the designated waymarked loops as shorter alternatives.
For those preferring single-day outings, the plateau offers 36 waymarked loop walks, colour-coded by difficulty:
- 4km Easy – A gentle forest circuit around St Patrick’s Well, ideal for families and dog walkers.
- 6.5km Rock Walk – Winds past small ancient cairns and offers panoramic ridge views over the border counties.
- 10km Tra Walk – A mixed route through forest and open bog with frequent lake vistas.
- 15km Hard – An extended ridge walk passing through Mullaghfad Forest and several upland loughs, best attempted in dry conditions.
All trails are marked with the distinctive orange-green Sliabh Beagh logo. While the waymarking is clear, an OS map (Series 44) or a downloaded GPS track is highly recommended, as the terrain can be disorienting in mist.
Key Sites & Landmarks
Several features stand out along the route network, each offering a different perspective on the plateau’s character:
- St Patrick’s Chair & Well – Located at the southern end of Altadaven Wood, this site is easily accessed via a short marked path from the car park. The ancient boulder seat remains a popular spot for quiet reflection.
- Bragan Penal Cross – Signposted from the R186, this stone cross stands in a remote, atmospheric setting. A short detour from the main trail makes it a rewarding stop for history enthusiasts.
- Muckle Rocks & Shane Barnagh’s Lough – An outcrop linked to local outlaw legends, reachable via a moorland track after Bragan. A footbridge crosses the Coolbrooke River nearby, offering a scenic pause.
- Mullaghfad Forest & Lakes – Home to Lough Cushkeery and Jenkin Lough, this area is a haven for birdwatchers and red squirrel spotting. The forest car park provides a convenient trailhead for the longer loops.
- Tully Forest – Located near the midpoint of the long-distance way, this woodland is a known stronghold for native red squirrels. Early morning visits increase the chances of spotting them.
- Mullaghfad Church – A remote 19th-century stone church surrounded by ancient yew trees. A small parking area off the long-distance route leads to a short walk through the quiet graveyard.
Wildlife & Nature
The blanket bog and lake ecosystem supports a surprising variety of wildlife. Hen harriers are frequently seen soaring over the heath, while golden plover and red grouse nest in the open moorland. The newly planted native woodlands have successfully attracted red squirrels, which are occasionally spotted foraging along the forest tracks. Birdwatchers should visit between late spring and early autumn, when nesting activity is highest and the heather begins to bloom. The shifting light over the loughs, particularly during early morning mist, provides excellent photographic conditions without the need for specialised equipment.
Practical Information
- Getting there – The R186 from Monaghan and the A34 from Northern Ireland provide the main road access. Designated car parks are located at Altadaven Wood (southern entrance), Mullaghfad Forest and near the Bragan Penal Cross.
- Navigation – All routes are waymarked. Carry a physical map or offline GPS, as mobile coverage is patchy across the moor.
- Facilities – Picnic tables and basic toilets are available at Altadaven Wood and Mullaghfad Forest. There are no commercial cafés on the trail; bring sufficient water and high-energy snacks.
- Seasonality – The bog becomes waterlogged and treacherous in winter. Late spring to early autumn offers the firmest ground and longest daylight hours. The long-distance way is not recommended for inexperienced walkers during wet or windy conditions.
- Safety & Conservation – Weather on the plateau changes rapidly. Sturdy waterproof boots, layered clothing and a compass are essential. As a protected SAC and Ramsar site, visitors must stay on marked paths, avoid trampling sphagnum moss and take all litter home.
Plan your visit around the waymarked loops if you are short on time, but allow at least two days to properly experience the full Sliabh Beagh Way. Check the Met Éireann and Met Office forecasts before setting out, as visibility can drop to near zero in the hollows.