Known in Irish tradition as Boherbradagh, meaning "thieves' road", this stretch of trackway near Kilcolman does not connect to any known road network, ancient or modern. On the 1842 Ordnance Survey six-inch map it appears as an isolated feature roughly 500 metres long, curving uphill to the south-east, with both ends simply terminating in open fields. By the time the 1904 survey was made, the northern end had been extended to meet a main road, but the original southern portion remained stubbornly unattached to anything. Cut into the hillside to a depth of 1.7 metres in places, and widening from about 2.7 metres at the south to nearly 4.9 metres at the north, it is edged along most of its length with stone-faced earthen banks and scarps, giving it the profile of a purposefully engineered route rather than a casual farm track.

What the engineering cannot explain, local tradition attempts to fill. Writing in 1905, Berry recorded the belief that the road was formed not by human labour but by enchanted cattle that came down from the mountains each day to drink from the Blackwater river, their repeated passage wearing the hollow path into the hillside. Bowman, writing in 1934, preserved a fuller version of the story: the cows freely gave milk to anyone who needed it, but when a greedy woman tried to milk them completely dry, they vanished and never returned along the road again. The name "thieves' road" sits uneasily alongside this tradition of generous, supernatural cattle, and whether the thievery refers to the woman's greed, to some earlier association with rustling, or to something else entirely, no source makes clear. A ringfort, a type of enclosed circular farmstead common in early medieval Ireland, lies roughly 60 metres to the west, hinting that the wider landscape was settled and active long before anyone thought to write any of this down.