A bawn, for the unfamiliar, is a walled enclosure typically associated with a tower house, used to protect livestock and provide a defensive outer layer. Most bawns are rectangular or roughly square. A circular example is considerably less common, and this one carries the added curiosity of having stood separately from the tower house it served, rather than abutting it directly.

The structure was formerly located to the west of the associated tower house at Castlefarm. E.R. McClintock Dix noted it in 1897, and by that point it was already being described as a remnant of something older, its form and function preserved mainly in the written record. The dimensions recorded, a diameter of 4.57 metres and a standing height of 1.07 metres, come from Conleth Clinton's 2005 study of tower houses in the Dublin and Meath region, which drew on that earlier nineteenth-century description. Those modest measurements suggest a structure more symbolic or practical than imposing, though the circular plan remains the detail that sets it apart from the more utilitarian rectangular enclosures found elsewhere across the Irish midlands and east coast.

Castlefarm sits in County Dublin, and anyone making their way there should be prepared for the fact that the bawn itself may not be immediately visible or accessible as a standing feature. The site is documented rather than prominently marked, and the notes compiled by Geraldine Stout suggest its current condition is best understood through the historical record rather than direct inspection. For those interested in the archaeology of late medieval settlement in the Dublin region, the value here lies less in what you can see on the ground and more in what the surviving descriptions reveal about the variety of enclosure types that once accompanied tower houses across the Irish landscape.