Few realise that roughly 325 metres to the south-south-east, on a broad terrace just back from a sharp drop in the ground, sits a second passage tomb, far smaller and almost entirely swallowed by heather.

A passage tomb, in simple terms, is a megalithic burial monument in which a stone-lined corridor leads into a central chamber, the whole structure typically covered by a cairn of loose stone or earth. This particular example has a circular cairn about 13.5 metres in diameter, enclosing a cruciform chamber, that is, one with side recesses branching off the main space, connected to the outside by a passage roughly 5.5 metres long, oriented to the south-east. The upright stones, or orthostats, that form the walls stand only between 0.3 and 0.7 metres high; the tomb is now roofless, and the passage is in a greatly ruined state. The cairn itself sits so low and flat that it barely clears the tops of the orthostats, and a kerb of set stones defines its outer edge. What makes the stonework quietly curious is the near-uniformity of the material: almost every visible kerb stone and orthostat is gneiss, a coarse-grained metamorphic rock common in the region, with a single exception. One limestone orthostat stands in the back recess of the chamber, distinct from everything around it. Whether that difference was deliberate, a matter of availability, or something else entirely, is not recorded. The site is documented by Stefan Bergh in his 1995 study of the Knocknarea landscape, and by Seán Ó Nualláin in his survey of the megalithic tombs of County Sligo published in 1989.

The tomb sits 15 metres from the terrace edge, where the ground falls away steeply to the south-east. It is largely concealed by heather, which means that even someone who knows to look for it can pass close without seeing it clearly. The low profile of the cairn, combined with the dense vegetation, makes it easy to read the site as unremarkable ground until the kerb stones begin to resolve themselves underfoot.