Twenty-nine toghers, as these bog roads are known, were identified in Killoran townland during a field survey, making it one of the more concentrated clusters of such structures found in a single area. A togher is essentially a trackway laid across waterlogged or boggy ground, built to allow passage where the earth alone would not support it, and the examples here range from simple arrangements of brushwood to more complex constructions combining brushwood with roundwood timber.

The survey, carried out by Gowen in 1999, revealed considerable variation in how these trackways were made. Fifteen of the toghers were built from brushwood alone, while the remainder used a mixture of brushwood and roundwood. Three showed evidence of pegs or stakes driven into the ground, suggesting a more deliberate effort to anchor the surface against the movement of the bog. Wood species were identified in thirteen of the toghers, and the selection is telling: alder, ash, birch, elm, hazel, holly, and mountain ash all appear, with ash and hazel being the most common. These are species that would have grown in and around wet woodland environments, likely gathered locally rather than transported any great distance. A radiocarbon date obtained from one togher, recorded as TN036-050164, placed its construction somewhere between AD 1024 and 1162, squarely within the early medieval period, though the other toghers in the group have not been individually dated and may span a broader range of time.

What makes this cluster quietly remarkable is the sheer number of structures in a single townland. These were not grand engineering projects but practical, repeated solutions to the problem of moving through difficult terrain, built and rebuilt by people who knew the bog and its materials intimately. The wood they chose, the stakes they drove, the brushwood they laid, all of it has survived because the bog itself is one of the most effective preservative environments on earth.