The catch is that there is nothing there to see. No ridge, no hollow, no subtle swell in the turf that might reward a careful eye. The site exists as a cartographic fact without a physical one.

The Record of Monuments and Places, the statutory list of known or suspected archaeological sites across Ireland, includes this location as a protected monument. That status means the site cannot be altered without consent, even though no surface trace of any archaeological feature has been confirmed on the ground. It is a reasonable precaution: earthworks in waterlogged or repeatedly ploughed land can disappear entirely from the surface while leaving traces of ditches, banks, or occupation below the soil. Poorly drained grassland of the kind found here is particularly prone to obscuring what lies beneath, and is also, paradoxically, sometimes better at preserving buried organic material than drier ground. Whether something genuinely survives underground at Tyfarnham, or whether the original mapping was uncertain to begin with, remains an open question.