While Inis Mór draws attention for its prehistoric stone forts and early Christian remains, the lighthouse at Eochaill occupies its own quiet category, a working navigational structure in a landscape more often read through archaeology than maritime history.

Eochaill, sometimes anglicised as Oghil, sits on the eastern portion of Inis Mór, and a lighthouse at this location would have served vessels navigating the waters between the Aran Islands and the Connemara coastline, a stretch of sea historically significant for fishing fleets and cargo traffic moving in and out of Galway. Lighthouses in this region were typically administered under the Commissioners of Irish Lights, the body responsible for aids to navigation around the island of Ireland, though the specific construction date and operational history of this particular structure are not currently documented in available sources.