Near the townland of Kye in County Roscommon, a grass-covered oval mound rises about 1.6 to 1.75 metres from what was once the bed of a reclaimed lake, its flat top and regular dimensions suggesting deliberate, careful construction rather than any natural accumulation of stone or soil. A cairn, in its simplest form, is a heap of stones raised over a burial or as a marker in the landscape, often dating to the Bronze Age or earlier. This one measures roughly 36 metres north to south and 28.5 metres east to west, with a levelled upper surface of about 23 by 14.5 metres, dimensions that point to something more considered than a field-clearance pile.

The site sits approximately 25 metres south-east of Pollacat Well, on terrain that only became accessible after the drainage and reclamation of the lake it once overlooked or perhaps stood within. It appears on the 1914 edition of the Ordnance Survey six-inch map, though its origins are considerably older than that cartographic moment. What makes the setting particularly interesting is the clustering of monuments nearby: a second cairn lies immediately to the south-east, and an earthwork of some kind sits roughly 90 metres to the north-east. Whether these features were laid out in relation to one another, or accumulated over different periods, is not recorded, but their proximity on this flat, once-waterlogged ground gives the area an atmosphere of accumulated, layered use across long stretches of time.