About twenty metres across, it sits on a submerged rocky plateau and is made up of loose, well-rounded boulders with thin soil and patchy overgrowth at its highest point. What draws attention is not its size but its details: faint, irregular wall lines just visible beneath the vegetation, hollow depressions a few centimetres deep scattered across the surface, and soil laced with frequent charcoal. These are the kinds of traces that suggest the island was once occupied, possibly built up or modified by human hands, and possibly a crannog.

Crannogs are artificial or semi-artificial islands, typically constructed from timber, stone, peat, and brushwood, used as dwelling places from the Bronze Age through to the early modern period across Ireland and Scotland. They are common enough in the Irish archaeological record, but each one presents its own puzzle. The Lough Guitane example was reported in December 2014 by Colm Chambers, who noted one particularly compelling feature: the remains of a collapsed dock or naust along the south-western side of the island, roughly eleven metres long and four metres wide, with a few intact courses of drystone walling still surviving at the rear. An upright stone at the end of the structure may have served as a mooring stone, though its age is uncertain. Chambers drew a comparison with a crannog on Moher Lake in County Mayo, which has a similarly described stone-lined dock. No timber was visible around the waterline at Lough Guitane, which makes firm dating difficult, but the charcoal in the soil and the sharp edge profile of the island add to the case for human construction or at least significant modification.

The island remains unexcavated and its status as a crannog is unconfirmed. What exists is a cluster of suggestive details, a collapsed harbour, faint wall traces, scorched earth, sitting quietly in a Kerry lake, waiting for closer attention.