The walls are not the orderly geometry of modern land division but something older and less legible, a mixture of curvilinear boundaries and small rectilinear enclosures spread across an area roughly 300 metres from north to south and 250 metres from east to west. Nobody has recorded a visit to the site itself; what is known comes entirely from above.

In July 1967, an aerial reconnaissance flight, logged under the reference CUCAP ATF 20, passed over Knockacarrigeen and captured the field system on camera. CUCAP, the Cambridge University Collection of Aerial Photography, documented thousands of Irish and British sites from the air during the mid-twentieth century, and many features invisible at ground level show clearly from altitude as cropmarks, soil discolouration, or, as here, the low relief of grassed-over stone. The walls at Knockacarrigeen fall into this last category. Their arrangement suggests a landscape that was once actively managed and subdivided, though no coherent overall pattern has been identified. The curvilinear boundaries in particular are characteristic of early field systems in the west of Ireland, where land was enclosed and worked long before the regular strip-field layouts of later centuries, but the site has not been dated or excavated, and its age remains an open question.