Heapstown Cairn

Overview

Heapstown Cairn dominates the low rise at the northern tip of Lough Arrow, just west of the River Uinshin. The mound sits in a grassy field beside the road at Heapstown crossroads, a short walk from the Bo and Arrow public house. At roughly 60 m (200 ft) in diameter and about 10 m (33 ft) high, it is Ireland’s fourth‑largest Neolithic cairn after the three Boyne‑Valley giants. The monument is surrounded by a kerb of massive limestone and sandstone slabs, many of which are still visible despite centuries of stone‑robbing.

Physical description

Sources give slightly different measurements for the cairn’s height. The Kiddle encyclopedia and Coastradar list a height of about 6 m (20 ft), while the Discovering Ireland guide and Story Archaeology describe it as approximately 10 m (33 ft) high. Both agree on a diameter of around 57–60 m (187–200 ft). The cairn sits at an elevation of roughly 65 m (213 ft) above sea level and covers about 0.4 ha (0.99 acres) of ground.

The outer kerb consists of a ring of large limestone blocks, some up to a metre high, which mark the original edge of the burial mound. The surrounding field is dotted with mature chestnut trees, and in spring yellow‑white wildflowers can be seen pushing through the stone‑filled soil.

Heritage designation

Heapstown Cairn is a National Monument of Ireland (Monument No. 152) and is listed on the Irish Sites and Monuments Record (SL034‑128). Its Irish name, Carn Ochtriallach, translates as “Ochtriallach’s cairn”, linking the site to the mythic Second Battle of Moytura. The cairn’s protected status means that, despite being on private land, the public may access it when the turnstile is open.

History

Constructed around 3000 BC, Heapstown Cairn is thought to be a passage‑grave type monument, comparable to the nearby Carrowkeel Megalithic Cemetery. No formal excavation has ever taken place, but the southeast side – the least disturbed part of the cairn – may conceal an intact passage chamber beneath the stones. In 1998 a fragment of megalithic art was identified on a south‑facing kerbstone, confirming its ritual significance.

Irish folklore adds layers of narrative. The cairn is traditionally identified as the burial place of Ailill mac Echach Mugmedóin, brother of the legendary Niall of the Nine Hostages. More dramatically, the site is linked to the Second Battle of Moytura. According to myth, the healer Dian Cecht filled the Well of Sláine with healing herbs; the Fomorians, led by the warrior Ochtriallach, blocked the well with stones, creating the massive heap that became Heapstown Cairn.

The cairn’s appearance has changed dramatically over the last two centuries. In George Petrie’s 1837 sketch the mound stood at its full height and bore a standing stone on the summit. By the time William Wakeman recorded it in 1878, much of the stone had already been removed for road‑building, walls and other local construction. The loss continued into the late 19th century until Captain M’C Ternan, the local resident‑magistrate, halted the quarrying. Today the cairn rises about 12 m (40 ft) and the original summit stone is gone, though local folklore remembers it as a pillar that once marked the top.

Archaeology and research

• 1998 art fragment – A small piece of prehistoric carving on a kerbstone was recorded, confirming that the cairn was used for ritual purposes.
• No formal excavation – Despite its size, the site has never been fully excavated, leaving the internal passage‑grave hypothesis untested.
• 1837 Petrie drawing – George Petrie’s early sketch shows the cairn with a prominent standing stone at the summit, a feature that has since disappeared.
• 1937 school folklore – A pupil from Ballyrush National School noted in the Folklore Commission Survey that a summit stone was still present, albeit fallen, suggesting the loss occurred in the mid‑20th century.

Mythology and folklore

The cairn is woven into the mythic landscape of ancient Ireland. The Dian Cecht story links the site to the Well of Sláine, a healing spring used by the Tuatha Dé Danann during the Second Battle of Moytura. The Fomorian champion Ochtriallach is said to have thrown stones into the well to block it, and the heap of stones that formed is the cairn we see today. The Irish name Carn Ochtriallach preserves this legend.

Another tradition names the cairn as the burial place of Ailill mac Echach Mugmedóin, a brother of the famed Niall of the Nine Hostages. Local oral history still recalls a standing stone that once marked the summit, a possible physical reminder of the mythic past.

What to See & Do

• Kerbstones and masonry – Walk the perimeter and examine the huge limestone blocks that form the cairn’s kerb. The western and north‑eastern sides show the most damage from historic stone‑robbing, while the southeast side retains a more complete ring of stones.
• Panoramic vistas – From the summit you can see the Bricklieve Mountains, the Carrowkeel cairns to the southwest, and the ridge of Moytura to the southeast. The distant peaks of Knocknarea, Carrowmore and Carns Hill punctuate the horizon, creating a classic megalithic skyline.
• Mythic atmosphere – The site is said to sit above the Well of Sláine, a legendary healing spring. Visitors often report a palpable sense of history, especially when the wind whistles through the surrounding chestnut trees.
• Archaeological curiosity – Although no passage has been uncovered, the southeast kerbstones hint at a possible hidden chamber. Enthusiasts of prehistoric architecture enjoy speculating about the tomb’s original layout.
• Landscape photography – The cairn’s low‑lying position makes it a striking foreground element against the rolling hills and the shimmering surface of Lough Arrow.

Visiting information

Access & parking

Heapstown Cairn lies on private land but is freely accessible when the turnstile is open. The gate is locked only when livestock are grazing nearby; a quick glance at the field will tell you whether the cows are present.

The nearest practical parking points are:

• Lay‑by on the N4 at Castlebaldwin – a small roadside lay‑by suitable for a few cars.
• Visitor car park at Lough Arrow – a larger, marked car park with basic signage for the cairn. From either location follow the sign‑posted path to the right of the crossroads.

Getting there

• From Dublin: Take the N4 to Castlebaldwin, turn right toward Ballindoon, stay right at the first junction, then after 3 km take the left at the next junction. Heapstown Cairn is sign‑posted 2 km on the right.
• From Belfast: Follow the A6 to Derry, then the A5 to Lifford, continue on the N15 to Sligo Town, join the N4 to Castlebaldwin and follow the same local directions as above.

Facilities & amenities

There are no toilets, cafés or visitor services on‑site. The nearest amenities are in Castlebaldwin and Ballindoon. The field can be uneven and occasionally boggy; sturdy boots or well‑tread shoes are advisable.

Best time to visit

Early morning light gives the best contrast for the cairn’s stonework, while late afternoon provides warm tones over Lough Arrow. The site is exposed, so a windy day can add drama but also make the walk more challenging.

Photography tips

• Arrive at sunrise for soft light and fewer visitors.
• Use a wide‑angle lens to capture the cairn against the surrounding hills.
• A tripod helps when shooting in low light during the golden hour.

Practical Information

Heapstown Cairn lies on private land but is freely accessible to the public when the turnstile is open. There is no formal visitor centre, ticket office or parking lot – the site is reached by pulling onto the minor road just off the N4 at Castlebaldwin and following the signposted path to the right of the crossroads. The cairn is a short walk from the road, and the surrounding field is level enough for a comfortable stroll.

Opening times & fees – The monument is open year‑round, free of charge. Access is governed solely by the turnstile’s status, which reflects the presence of grazing cattle.

Coordinates

Nearby attractions

• Carrowkeel – A cluster of 22 passage‑tombs about 5 km southeast, part of the same prehistoric landscape.
• Carrowmore Megalithic Cemetery – One of Ireland’s largest megalithic complexes, roughly 15 km to the west.
• Knocknarea – The hill crowned by the iconic Queen Maeve cairn, offering further panoramic views.
• Bricklieve Mountains – The range that shelters Carrowkeel and provides scenic walking routes.
• Lough Arrow – A tranquil lake ideal for a picnic or a gentle lakeside walk before or after visiting the cairn.