Overview
Knockmore (Irish: An Cnoc Mór, “the great hill”) is the highest point on Clare Island, rising to 462 m above Clew Bay in County Mayo. Its broad, peat-dotted summit offers some of the most expansive coastal panoramas in the west, stretching from the jagged archipelago of Clew Bay to the distant Mull of Kintyre across the Atlantic. The mountain is a favourite with walkers who appreciate compact, well-marked routes that deliver dramatic scenery without demanding technical climbing skills.
Clew Bay and the surrounding archipelago, as seen from Clare Island.
Getting There & Practical Info
Clare Island is accessed by passenger ferry from Roonagh, just south of Westport. The crossing takes around 15 minutes, and tickets should be booked in advance, especially during summer and weekends. Once on the island, Knockmore is a short walk from the village. There is no admission charge, and the mountain is open year-round. Parking is limited on the island, so most visitors arrive via the ferry with minimal luggage. The summit is reachable on foot only, with no vehicle access.
Walking the Summit Routes
Two main approaches lead to the top, both starting from the island’s main settlement and converging near the summit cairn.
- South Approach (Wicklore Route): This path begins near the water-treatment area on the island’s southern side. It covers roughly 1 km each way and typically takes 2 hours round-trip. The terrain is gentle heather slopes leading to a broad plateau of peat hags. It’s quiet, free of quad tracks, and offers uninterrupted views of Clew Bay and the mainland.
- North Approach (Road-Flank Route): Starting from a layby on the north-west flank, this route is about 1.5 km to the summit (3 km return) and takes 1.5–2 hours. The initial ground is rougher, giving way to a steady grassy ridge climb. From this angle, walkers can spot Croagh Patrick, Mweelrea, Achill Head, and the Nephin Beg range on clear days.
Both routes are well-signposted and suitable for walkers of moderate fitness. The summit cairn marks the highest point and provides a safe, sheltered spot for a break.
Landscape & Wildlife
Knockmore’s geology is a mix of psammitic and semi-pelitic schists from the Sraheens Lough Formation, with limestone outcrops along the western cliffs. The upper slopes are characterised by peat hags – irregular, mushroom-shaped peat formations that give the hill a distinctive, weathered texture. The surrounding grasslands and heath support hardy sheep, while seasonal pools attract frogspawn after rain. Birdwatchers often spot meadow pipits, skylarks, and occasional raptors circling the thermal updrafts. The western limestone cliffs are particularly striking in the low light of early morning or late afternoon.
History & Archaeological Connections
While the mountain itself holds no recorded ancient structures, its Gaelic name reflects a long tradition of naming prominent natural features. The wider island is part of the Clew Bay Archaeological Trail, which includes a 16th-century tower house, a Cistercian abbey founded by St Brigid, and a Bronze Age court tomb. Many visitors combine the Knockmore ascent with a walk to these nearby sites, tracing how the island’s rugged terrain and coastal location shaped centuries of settlement and spirituality.
Tips for Visitors
- Footwear: Sturdy walking boots are essential. The peat hags and grassy tracks can be soft and uneven, especially after rain.
- Weather: Atlantic weather changes quickly. Pack a waterproof layer and windproof jacket, even in summer.
- Timing: Start early to avoid midday winds on the summit, and allow time to explore the village or abbey on the way back.
- Navigation: Routes are well-marked, but carrying a map or offline GPS is advisable, as mobile signal can be patchy on the upper slopes.
- Ferry Note: Return ferry times are fixed. Check the schedule before heading out to ensure you catch the last crossing back to Roonagh.
Knockmore rewards a steady climb with quiet, sweeping views and a genuine sense of the island’s character. Arrive with good boots, check the ferry timetable, and let the trail guide you up to the cairn for a pause over Clew Bay.