What makes it unusual is not the fact of its disappearance, harbours have come and gone throughout Irish coastal history, but the fact that nobody is entirely sure where it stood. It survives in the record as a place that existed, was used, and was then forgotten, its precise location unresolved to this day.

The harbour at the Pill is noted by Clarke, writing in 2002, as having been in operation by 1470 and disused by 1610. That window of roughly a century and a half suggests a functioning, if modest, landing point rather than a brief or accidental use of the shoreline. The name itself is worth pausing on. A pill, in the context of Irish and Welsh coastal geography, typically refers to a small tidal creek or inlet, the kind of narrow channel that would have offered shelter for smaller vessels without the infrastructure of a formal quay. Such features were common along the Dublin coast and its river margins, and many were pressed into service for local trade, fishing, or the movement of goods before larger purpose-built harbours made them redundant. By the early seventeenth century, shifts in trade patterns, silting, or simple neglect could all conspire to leave such a place abandoned, and in this case the location itself appears to have been lost along with the activity it once supported.

Because the site has not been precisely located, there is nothing specific to stand before or photograph. What it offers instead is a particular kind of curiosity, the knowledge that somewhere in County Dublin, probably along a stretch of tidal ground that looks entirely unremarkable today, boats once came and went regularly enough to leave a name and a date in the historical record. Researchers with an interest in medieval and early modern Dublin's coastal economy may find Clarke's 2002 work a useful starting point for thinking about the broader network of small landing places that once supplemented the more prominent port facilities of the city. For anyone else, it serves as a small reminder that the coastline we see now is not the coastline that was.