The hillock itself is modest, its flat upper surface measuring roughly 30 metres by 17.5 metres, hemmed in by a field wall to the north and a low earthen bank to the west, its slopes thick with vegetation. Somewhere beneath that unremarkable surface is the entrance to a souterrain, the term used for the dry-stone underground passages and chambers built in early medieval Ireland, most commonly associated with ringforts and used for storage, refuge, or both.

The east-facing entrance is a tight square, just 75 centimetres on each side, leading into a passage aligned roughly north to south and extending at least 3.9 metres before collapse blocks any further progress. Whether the passage originally continued beyond that obstruction is unknown. It is a confined space throughout, roughly 90 centimetres wide and 1.35 metres high, roofed with flat lintels and floored with a scatter of small loose stone. The construction is mixed: the western wall is built from large upright slabs with cruder drystone masonry above, while the eastern wall is simply compacted earth. Near the southern end of the passage, a creepway opens off to one side, a further narrowing of just 45 centimetres square, though clay fill quickly blocks access beyond it. The site has been tentatively identified with a place referred to as 'Liosachán' by the Kerry topographer Ó Cíobháin in a 1984 study, a name suggesting a small lios, or earthen enclosure, which fits the character of the hillock above.