Stretching 171 metres in length and about 20 metres wide, this hollow way, the term for a route worn or cut below the level of the surrounding land over long periods of use, is flanked on either side by a low earthen bank. It sits 150 metres east of a hilltop enclosure, and everything about its alignment suggests it was not a casual track but a deliberate approach.

The feature at Ballynaclin becomes more interesting when you consider where it is pointing. The enclosure it leads towards has been tentatively identified as a possible henge, a class of monument typically dating to the Neolithic or early Bronze Age, usually consisting of a circular bank and ditch arranged to enclose or define a ceremonial space. If that identification holds, then this sunken road may represent the formalised approach to a site of considerable prehistoric significance, a managed corridor directing movement up the hill towards whatever activity or ritual the enclosure once hosted. The hollow way itself is not currently visible on the ground in any obvious way to a casual observer, but it shows clearly on aerial photography, where the slight depression and its flanking banks emerge from the landscape as a coherent, purposeful form.