Heapstown Cairn, Neolithic cairn near Lough Arrow, Ireland
The circular stone structure extends 57 meters in diameter and rises 10 meters high, combining limestone and red sandstone materials from the local area.
Construction of the monument dates to 3000 BC, with evidence suggesting it contains a passage grave similar to those at nearby Carrowkeel Megalithic Cemetery.
Local traditions connect the site to Ailill mac Echach Mugmedóin, brother of Niall of the Nine Hostages, marking it as his burial location.
Access to the cairn requires following the N4 toward Sligo, turning right at Castlebaldwin, and continuing to Heapstown crossroads where a stile leads to the field.
The structure ranks as Ireland's fourth largest cairn, featuring passage grave-style megalithic art discovered on a south-facing kerbstone during 1998 investigations.
Location: County Sligo
GPS coordinates: 54.09503,-8.34850
Latest update: March 3, 2025 08:12
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