At Derrynafeana, on level bogland running north from the Kilduff river towards the lower slopes of Slievanore, a network of pre-bog walls has emerged where the bog has been cut away, revealing field boundaries, hut foundations, enclosures, and a stone trackway that together suggest a settlement of considerable complexity. The bog, which formed over these structures long after they were abandoned, acted as an accidental archive, sealing everything in place.

The remains are concentrated in two roughly rectangular zones southeast of Lough Acoose. In the first, which stretches approximately 240 metres north to south and 100 metres east to west, walls survive as lines of boulders and low orthostats, upright stones used to form boundaries, exposed to an average height of around 60 centimetres. One wall meanders the full length of the area, with both straight and curving walls extending from it like branches. Scattered to the east of this main spine are five hut foundations and two small enclosures, ranging from 2.5 to 6 metres in diameter, their low walls still readable in the ground. A fragment of a stone trackway is visible near the northernmost hut. The second concentration of walls lies roughly 100 metres to the east, covering a wider east-west span of around 190 metres. Here, shorter wall sections are exposed, and several have been cut through by drainage channels, which has had the useful effect of confirming that the walls were built directly on the mineral soil that lies beneath the peat. About 230 metres south of the main field system sits a fulacht fiadh, a type of prehistoric cooking site typically identified by its mound of fire-shattered stone and an associated trough or pit. This one is a substantial semicircular mound nearly a metre high, with an enclosed flat area at its centre just over 2.5 metres across. A circular hut of large boulders stands adjacent to the east, its walls still reaching 70 centimetres in places, and isolated stretches of pre-bog walling connect it back towards the field system to the north. The whole complex was documented and described in Aidan O'Sullivan and Jerry Sheehan's archaeological survey of the Iveragh Peninsula, published by Cork University Press in 1996.