What exactly they are is genuinely unresolved. Spotted on aerial photography from November 2011, the seven low mounds invite two quite different readings: they could be prehistoric barrows, the kind of burial mounds common across the Irish midlands, that were later absorbed and repurposed as ornamental landscape features; or they may have been created entirely as part of the post-1700 landscaping of the Killua Castle Deerpark, with no prehistoric origin at all. The name "Labyrinth" belongs to one of these earthworks specifically, which hints at an 18th or 19th-century decorative purpose, though nothing in the surviving record confirms what form it took.

Killua Castle itself lies roughly 570 metres to the north-north-east of the earthworks. The first edition Ordnance Survey six-inch map shows that this area of the demesne was once planted with tree groves, with an old pathway threading through the deerpark, suggesting a designed landscape of some ambition. A separate "Old Deer Park" is marked 650 metres to the south on the 1837 edition of the same map, indicating that the grounds were extensive and carefully managed. A post-1700 monument of some kind was also erected on the demesne, approximately 270 metres to the north-north-east. Ninety metres to the north of the labyrinth earthwork lies a ringfort, one of those circular enclosures used for settlement and agriculture throughout early medieval Ireland, which raises the possibility that the landscape here was already shaped by human activity long before any castle or deerpark came into being.