Overview
Croaghaun Cliffs dominate the north‑western horizon of Achill Island, soaring to 688 m (2,257 ft) above the Atlantic – the highest sea cliffs in Ireland and the third‑highest in Europe. The cliffs form the sheer northern face of Croaghaun Mountain, the island’s most westerly peak. Their dramatic drop into the ocean, rugged rock faces and sweeping panoramas make the area a bucket‑list destination for seasoned hill‑walkers and anyone craving raw Atlantic scenery.
The most popular access point is the Keem Bay car park on the southern side of the mountain. From there a well‑marked but steep trail climbs roughly 5 km (2‑3 hours) to a series of viewpoints that reveal the cliffs, the surrounding bays and the distant Atlantic horizon.
History & Background
While the cliffs themselves are a natural marvel, the landscape bears traces of human activity. Mid‑19th‑century coast‑guard lookout ruins – often referred to as Charles Boycott’s house – sit on a ridge overlooking Keem Bay. These stone structures were part of a network of maritime watchpoints that monitored the treacherous Atlantic waters and enforced customs regulations. During the Second World War an additional observation post was built at Moytoge Head above the bay, forming part of Ireland’s neutral‑defence network.
The ruins now serve as a convenient rest stop and a reminder of the island’s maritime heritage. Their weathered walls contrast with the wild, untouched character that Achill has retained, especially when compared with the more accessible Cliffs of Moher.
Recognition & Awards
Keem Bay, the golden‑sand beach that frames the Croaghaun Cliffs, has earned international acclaim. It was named one of Lonely Planet’s Top 100 Beaches in the World (2024) and is the only Irish entry in that list. The beach also holds Blue Flag status, confirming high standards of water quality, safety and environmental management.
These accolades have helped raise the profile of the whole area, yet visitor numbers remain modest because the cliffs can only be reached on foot or by boat.
Wildlife & Environment
The cliffs and surrounding coastal habitats support a range of wildlife. Seasonal basking sharks (Cetorhinus maximus) are frequently sighted in the clear waters of Keem Bay, attracted by the plankton‑rich Atlantic currents. The cliff edges provide nesting sites for seabirds such as gulls and fulmars.
The upland area is covered in heather (Calluna vulgaris) and supports typical Atlantic flora. The two corrie lakes below the viewpoint – Lough Acorrymore and Lough Corrymore – add tranquil freshwater habitats to the rugged scenery.
Geology & Landscape
The cliffs are composed of the Keem Conglomerate Formation, a late Neoproterozoic (c. 750–600 Ma) assemblage of quartz conglomerates, pebbly psammites and cobbles. Glacial erosion during the last Ice Age carved the deep‑set valley that now houses Keem Bay, exposing the hard‑wearing rock that forms the sheer sea faces.
What to See & Do
| Point of Interest | Description |
|---|---|
| Keem Bay | A Blue‑Flag, pale‑blonde beach framed by the cliffs; ideal for a quick dip before the ascent. |
| Coast‑guard ruins | The stone remains of the 19th‑century lookout provide shelter and a dramatic backdrop for photos. |
| Benmore Cliffs viewpoint | Offers sweeping views of the lower cliffs and the Atlantic below. |
| Croaghaun Cliffs viewpoint | The final reward – a panoramic tableau of the towering sea cliffs, two corrie lakes, and the endless ocean. |
| Basking shark spotting | Best from late spring to early autumn; keep an eye on the water from the beach or the cliff edge. |
The hike is divided into several natural stages. After leaving the car park, the trail climbs steeply across open grassland, where early‑morning mist can make the ground slippery. Reaching the coast‑guard ruins, walkers are treated to a brief panorama of Keem Bay on the left and a sheer drop on the right – a place to pause and absorb the scale of the landscape.
Continuing onward, the path skirts the Benmore Cliffs, a series of rock ledges that, while lower than Croaghaun, still command impressive views. The final ascent to the Croaghaun viewpoint is less steep than earlier sections but still demands careful footing, especially after rain when the ground can become boggy.
For those with extra time, the surrounding area offers additional adventures:
- A short detour to Corrymore Lake provides a tranquil lakeside walk.
- The Atlantic Drive loop (19 km) showcases other coastal highlights such as Grace O’Malley’s Towerhouse and the White Cliffs of Ashleam.
- Cyclists can tackle the Great Western Greenway (43.5 km) which links Westport to Achill via a scenic, traffic‑free route.
- The historic Achill Head viewpoint offers seabird watching and sweeping sea‑stack scenery.
Nearby Attractions & Routes
- Ballycroy National Park – a short drive north offers woodland walks and the famous Glenamoy Bog.
- Grace O’Malley’s Towerhouse – a 16th‑century fortification near the Atlantic Drive.
- White Cliffs of Ashleam – another striking sea‑cliff formation accessible from the same loop.
- Great Western Greenway – ideal for cyclists wanting to explore the Wild Atlantic Way without tackling the steep climbs.
Practical Tips
Getting there – Achill Island is linked to the mainland by the Michael Davitt Bridge on the N59. From Westport or Ballina, follow signs for the Keem Bay turn‑off (approximately 30 km from the bridge). The road to the bay is narrow and winding; larger vehicles may find it challenging.
Parking – Two official car parks serve the trailhead: the Lower Car Park (closest to the start) and the Upper Car Park (a short walk uphill). Both fill quickly in summer, so arriving early is advisable. An additional overflow area exists near Corrymore Lake.
Public transport – No direct bus service reaches Keem Bay. The nearest bus stop is in Dooagh; from there a taxi or a hike of about 5 km is required.
Trail conditions – Classified as strenuous. Expect three sustained steep sections and exposed sections close to the cliff edge. Fog can descend rapidly; carry a map, compass and consider a GPS app. Mobile reception is limited on the upper sections.
Facilities – A public toilet is located just above the Keem Bay car park. There are no cafés or shops on the trail, so bring water and snacks. Lifeguards patrol Keem Bay during the summer months.
Seasonality – The hike is possible year‑round, but the most reliable conditions are from late spring to early autumn. Winter storms can bring high winds and heavy rain, making exposed sections hazardous.
Dog policy – Dogs are permitted on the trail but must be kept on a lead during the summer months when the beach is busy and lifeguarded.
Accessibility – The path is not suitable for wheelchairs or those with limited mobility due to steep gradients, uneven terrain and lack of handrails.
Safety notes – Stay well back from the edge, especially on windy days. The ground can be very slippery when wet, and after rain the lower sections become boggy. Proper hiking boots with good grip are essential. Inform someone of your intended route and expected return time.
No admission fee – Access to the cliffs and the trail is free of charge.
Enjoy the sense of isolation, the roar of the Atlantic, and the unrivalled height of Ireland’s most spectacular sea cliffs – a true highlight of any Achill Island adventure.
Figure unchanged as originally provided.