Slieve Carr

Overview

Slieve Carr rises to 721m in the north-west of County Mayo, marking the highest point within Wild Nephin National Park. Recognised by mountain recorders and hiking guides as Ireland’s most remote mainland summit, the peak sits over 14km from the nearest road. The mountain runs on a north-south axis, its eastern slopes crisscrossed by a chain of small tarns known as the Carr Lakes or Scardaun Loughs. These melt into a vast expanse of blanket bog and purple heather. Reaching the stark, open summit rewards walkers with uninterrupted 360-degree panoramas stretching from the Atlantic coastline to the distant Nephin peaks and the sweeping wilderness of Ballycroy.

History & Mythology

At the summit stands an ancient burial cairn known locally as Laghtdauhybaun, or Leacht Dáithí Bháin (“burial monument of white Dáithí”). Local folklore ties the site to Dathí, a 5th-century king of Connacht reputed to be Ireland’s last pagan high king. The Irish name Corrshliabh translates simply to “pointed mountain”, while 19th-century maps by William Bald recorded it as Curslieve, confirming the various spellings refer to the same peak.

In 1937, naturalist Robert Lloyd Praeger described the surrounding bogland as “the very loneliest place in the country”. For generations, the slopes formed part of the historic Bangor Trail, a rugged pack-horse route used by farmers moving livestock across the wild west of Mayo. The mountain’s geology reflects its ancient origins, composed of banded, graded and X-bedded quartzite from the Bangor/Corslieve Formation. With a prominence of 646m, it features on the Arderin, Vandeleur-Lynam and Irish Highest Hundred mountain lists.

Routes to the Summit

Four main approaches cater to different experience levels, though all require careful preparation due to the lack of waymarking on the upper plateau.

• Bangor Trail Approach: The 25km historic trail skirts the western flank of Slieve Carr. From the trailhead at the R311 lay-by, follow the marked section to the Tawnyanruddia spur and then the summit ridge. The round-trip typically takes 5–6 hours.
• Letterken Loop: A 28.7km loop that starts near the Letterken Bothy. This route climbs the south-east ridge and offers the best views of the Carr Lakes. Rated as difficult, it involves roughly 999m of elevation gain and takes around 7 hours and 25 minutes. It can be split over two nights using the bothy.
• East via Forest Tracks: Starting from the small car-park at Letterken Bothy, a forest track crosses a bridge and leads to a small lake. From there, follow a fence onto open ground and ascend the SE ridge. This approach avoids the boggiest sections.
• Direct West-East Bog Route: The most direct line from the road to the summit crosses extensive bog. This route demands strong navigation skills and is only recommended for experienced hill-walkers carrying a map and compass.

What to See & Do

• Summit & Lakes: The climb traverses heather-covered moorland before reaching the cairn. Detour to the eastern Carr Lakes or the clearer Scardaun Loughs for reflective water-scapes that provide a welcome rest stop.
• Wildlife Spotting: The park supports a rich variety of species. Keep an eye out for red-breasted choughs, peregrines, curlews, meadow pipits and ravens. Otters are occasionally spotted along the Altaconey River, while Greenland white-fronted geese and red grouse inhabit the wider bogland.
• Stargazing: Slieve Carr lies within the Mayo Dark Sky Park. On clear evenings from June to August, the absence of light pollution makes for exceptional stargazing conditions.
• Shelters & Bothies: The area is sparsely serviced, but several unstaffed, free shelters exist for self-sufficient walkers. The Letterken Bothy offers a stone shelter with a bench and logbook near the trailhead. The Brogan Carroll Bothy serves as an emergency shelter near the Tawnyanruddia spur. Within the surrounding pine forest, Coillte maintains the Altnabrocky Wilderness Huts, which provide basic seating and logbooks for overnight bivouacs. Always follow a strict “leave no trace” ethic.

Seasonal & Weather Advice

• Best months: Late spring (May–June) through early autumn (September) offer the longest daylight hours and the most reliable footing.
• Winter conditions: The summit can be covered in snow and the boggy sections become extremely treacherous. Most walkers avoid the mountain during severe winter weather.
• Weather warnings: The National Parks and Wildlife Service advises against venturing out in bad weather. Sudden Atlantic storms can bring high winds and heavy rain, turning the bog into a safety hazard. Mobile coverage is patchy across the range, so carry a fully charged phone and consider a personal emergency beacon.

Practical Information

The mountain is managed by the National Parks and Wildlife Service as part of Wild Nephin National Park. Plan for a full-day walk, carry sufficient water, dress in layers for rapidly changing conditions, and ensure your navigation equipment is ready before leaving the trailhead.

Nearby attractions: Combine a visit to Slieve Carr with a walk in Ballycroy National Park or a drive to the coastal village of Ballycroy Village. For those continuing west, the dramatic scenery of Bangor Erris and Achill Island is visible from the summit on clear days. Check the seasonal shuttle schedule in advance if you are relying on public transport to reach the trailheads.