A midden, essentially a refuse deposit left by people who gathered and cooked shellfish at the shoreline, this one measures just under nine metres by less than four, and averages only twenty centimetres in depth. Small as that sounds, it contains a considerable record: two distinct areas of burning, evidenced by blackened sand, fire-shattered stones, and charcoal, suggest repeated use of the site for cooking rather than a single episode of activity. An annular ring and a small number of iron nails recovered from the surface complicate any straightforward reading of the deposit's age, hinting at at least some activity during historical rather than prehistoric times.

Rossbehy Spit itself is a striking geographical feature, an irregularly shaped promontory roughly four kilometres long and up to three quarters of a kilometre wide, projecting northwards into Dingle Bay on the Iveragh Peninsula in south Kerry. The midden sits close to the north-western end of a sea-wall that dates to the mid-nineteenth century, which places it in a landscape that was already being managed and engineered within living memory of its exposure. The shellfish content is dominated by cockles, but oysters, mussels, periwinkles, whelks, and barnacles also feature, a mixture that reflects the varied intertidal resources available along this stretch of coastline. Interspersed throughout the deposit are mostly small pebbles, alongside a number of larger, flatter stones averaging roughly twenty by fifteen centimetres, which may have been used as rudimentary cooking surfaces or hearth linings. The deposit lies buried under one and a half metres of accumulated sand dune, which is itself part of what makes the spit archaeologically interesting: the dunes both conceal and, in places, expose what lies beneath, depending on how wind and tide reshape them over time.