At the village of Eochaill, on the edge of a north-facing limestone terrace, there is a structure that has been almost entirely swallowed by the landscape around it: an oval cashel, a type of stone-walled enclosure built without mortar, whose outline can barely be traced at ground level.

The enclosure measures roughly 23 metres on its north-to-south axis, but very little of its fabric remains legible. A cashel is essentially a ringfort built from drystone rather than earthen banks, and on the Aran Islands, where earth is scarce and limestone abundant, this was the natural construction method. Here, the defining wall has collapsed almost entirely, and from the east-north-east round to the south there is no visible trace of it at all. What does survive on the southern, western, and northern arc has been absorbed into a modern field wall, the kind of practical recycling that happened quietly across Ireland over centuries, as farmers incorporated ancient stonework into boundaries without any particular awareness, or concern, that they were doing so. The site was noted by O'Flanagan in 1927 and again by Tim Robinson in 1980, the latter being the cartographer and writer whose extraordinarily detailed mapping of the Aran Islands brought many such overlooked features to wider attention.