It is small enough to walk in under an hour, well known for its Martello tower and ruined church, and yet somewhere along its shoreline, at a date and in circumstances now largely lost to the record, a number of people were buried in stone-lined graves that have since vanished from any reliable map.

A cist, in the archaeological sense, is a box-shaped grave constructed from flat slabs of stone, sometimes capped with a covering slab, and typically associated with prehistoric burial practice, though the form persisted across several periods. According to R. Scantlebury, writing in 1960, cists containing human remains were found near the shore of Dalkey Island, though no account of any associated finds was recorded at the time. The reference is brief and frustratingly spare: no grave goods, no skeletal description, no indication of how many individuals were represented or when they were interred. An earlier note by O'Reilly, published between 1902 and 1904, acknowledged that the burials had not been precisely located even then, which suggests that by the early twentieth century the site was already a matter of second-hand report rather than direct observation. What was found, by whom, and under what circumstances remains unclear.

Dalkey Island is accessible by a short boat crossing from Coliemore Harbour in Dalkey village, with seasonal ferry services typically running in the warmer months. The island is uninhabited and managed as a nature reserve, so visitors should expect a wild, unmanicured landscape rather than a maintained heritage site. There are no markers for the cist burials, and given that their location was unresolved even a century ago, there is little prospect of standing over the precise spot. What the island does offer is a strong sense of layered occupation, from the Neolithic to the early Christian period and beyond, and the shoreline itself, where the graves were reportedly found, repays a slow walk. The ground here has given up its contents before, quietly and without record.