Knocknashee – The Hill of the Fairies

📍 South‑west County Sligo, Sligo

🏛️ Attraction

Last updated: 28 April 2026

Overview

Benbulben, Sligo
Benbulben, Sligo Tourism Ireland photographed by Gareth McCormack

Knocknashee (Irish: Cnoc na Sí – “Hill of the Fairies”) rises to 276 m on the edge of the Ox Mountains and dominates the drumlin plain of south‑west Sligo. The hill is a classic table‑top Marilyn, easily spotted from the N17 between Tubbercurry and Collooney. Its limestone cap, encircled by two massive earth‑and‑stone ramparts, encloses an area of roughly 53 acres (700 m × 320 m). From the summit you can see the Ox Mountains, Benbulben, Knocknarea, and on a clear day the distant silhouette of Croagh Patrick.

History & Background

Carrowkeel megalithic Site, Co Sligo
Carrowkeel megalithic Site, Co Sligo Courtesy SligoWalks.ie

The site was first identified as a hill‑top fort in 1988 during an aerial survey by the Office of Public Works. Archaeologists now recognise Knocknashee as one of Ireland’s largest Bronze Age hill‑forts, a fortified settlement that may have acted as a regional capital around 1000 BC. The fort’s double ramparts are built of limestone and earth, and within the enclosure lie two neolithic passage‑graves, a cluster of about thirty circular hut foundations, and a series of subsidiary ditches that run around the hill at three levels (top, middle, bottom).

The northern cairn (≈ 28 m diameter, 2.5 m high) has never been opened, while the southern cairn (≈ 28 m diameter, 1 m high) contains a chamber of large limestone slabs whose entrance faces north‑west. The chamber floor is a single massive slab, and faint scratchings on the western wall echo early Christian motifs found at Knowth. Around the cairns, the hut sites – each 7–11 m in diameter, bounded by low stone walls and sometimes surrounded by shallow fosses – suggest a semi‑permanent community that lived under the protection of the fort’s walls.

Literary references add a layer of myth: Deirdre Kinahan’s play Knocknashee (2002) and the traditional song “The Hills of Knocknashee” both celebrate the hill’s fairy‑laden reputation. Folklore tells of a “wishing chair” on the southern face; if you sit there and can spot Croagh Patrick, a wish is said to be granted.

What to See & Do

Tully Castle
©Tourism Ireland
FeatureDescription
Hill‑fort rampartsTwo concentric earth‑and‑stone banks that outline a 53‑acre plateau.
Northern cairnUnopened neolithic passage‑grave, 28 m across, 2.5 m high.
Southern cairnOpen chamber of quarried limestone slabs; entrance broken in antiquity.
Hut‑site clusters~30 circular foundations, 8–11 m across, some with identifiable doorways and surrounding fosses.
Panoramic viewsOx Mountains, Benbulben, Knocknarea, Croagh Patrick (clear days), Court Abbey to the southeast.
Wishing chairA natural rock seat on the southern slope linked to local fairy lore.

Walkers can follow the red‑arrow waymarks from the roadside parking area. The route begins at a “kissing gate”, climbs a steep gravel path (about 120 m ascent over 0.5 km), and passes a pair of carved‑wood seats that double as viewpoints. At the plateau you may choose a direct line to the cairns or take the circular wall‑walk that loops the summit, offering ever‑changing perspectives of the surrounding countryside.

Guided tours are available through Seatrails (group price €100) and include a professional archaeologist who explains the cairns, hut sites and the broader mythic landscape that links Knocknashee to nearby sites such as Muckelty Hill, Carrowkeel and Knocknarea.

Practical Information

  • Trail length & time: 1.2 km out‑and‑back (≈ 5.5 km round‑trip on the longer SligoWalks route) – about 1 – 1.5 hours for most walkers. Visitor guides also note a 45‑minute ascent‑and‑descent for those taking the direct route.
  • Difficulty: Strenuous – steep initial climb, uneven limestone steps, and a few short stair sections.
  • Waymarking: Red arrows on the path; a stile marks the entrance to the open plateau.
  • Parking: Limited roadside space for 2–3 cars just off the N17 near the Sacred Heart Church. Early arrival is advisable, especially in summer.
  • Access: The hill lies on private farmland; the landowner grants permission for public use, and visitors are asked to treat the archaeological features with respect.
  • Dogs: Not allowed on the hill‑fort area.
  • Facilities: No permanent visitor centre; a modest car‑park at the trailhead and a few wooden benches on the ascent.
  • Guided walk cost: €100 per group (Seatrails), includes archaeological commentary and optional visits to nearby early‑Christian sites such as Court Abbey.
  • Public transport: Regular bus services run along the N17; the trailhead is about 3.5 km from the nearest stop.
  • Safety: The path can be wet and slippery; sturdy walking boots are recommended. The summit is open grassland, so stay on marked routes to protect the cairns and hut foundations.

Visiting Tips

  • Time required: Most visitors complete the climb in roughly 45 minutes each way, making it a quick half‑day outing.
  • Best season: Clear, dry days in late spring to early autumn provide the most expansive views. Winter can bring icy sections on the limestone steps, so extra caution is needed.
  • What to bring: Water, a wind‑proof jacket, and a good pair of walking shoes. A camera is useful for the panoramic vistas.
  • No entry fee or opening hours: The site is free and open year‑round; there is no ticket office or staffed facility.
  • Leave no trace: Keep to the marked paths, especially around the cairns and hut foundations, to preserve the archaeological integrity.

Nearby Attractions

  • Benbulben Forest Walk – A 7 km loop that skirts the base of Benbulben, offering forest scenery and additional hill‑fort viewpoints. [/benbulben-forest-walk/]
  • Carrowkeel Megalithic Complex – A short drive north‑east brings you to one of Ireland’s most important Neolithic passage‑grave sites. [/carrowkeel/]
  • Court Abbey – Ruins of a 13th‑century Franciscan friary, often included in Seatrails’ extended tours.
  • Knocknarea – The hill crowned by the legendary Queen Maeve’s cairn, visible from Knocknashee’s summit.