The enclosure at Doonmacfelim measures approximately 22 metres east to west and 21 metres north to south, its outline now traced more by uneven ground and overgrown vegetation than by any dramatic wall or bank. What survives most clearly is a stretch of limestone outer revetment, the facing stones laid against the outside of an earthen or rubble core, visible for several metres along the southern side. That the interior remains clear of overgrowth, while the surrounding band of three to four metres is tangled and irregular, gives the site an oddly tended appearance from certain angles.

The enclosure does not sit in isolation. It lies within a multiperiod field system, meaning the landscape around it preserves boundaries and divisions from more than one era of use, laid one over another across the karstic pavement. Karstic terrain, formed by the slow dissolution of limestone, creates the Burren's characteristic fissured surface, and it is across this uneven ground that the enclosure and its neighbours are distributed. Within roughly 110 metres, two cashels also survive: one approximately 38 metres to the west-southwest and another about 108 metres to the east-northeast. A cashel is a stone-walled enclosure, typically circular, associated with early medieval settlement in Ireland, often serving as a farmstead or defended residence. Whether this enclosure shares the same period of use as those cashels, or belongs to an entirely different phase of the field system's long history, is not certain from what survives at the surface.