Subcircular in shape and measuring roughly 37 metres east to west and 34 metres north to south, it sits on ground that looks out over wide bogland stretching to the west and north. That relationship between an enclosed domestic space and the open, waterlogged terrain beyond it was probably deliberate; early medieval farmers who built and lived in raths understood the value of a defensible, well-positioned homestead.

A rath is an earthen ringfort, typically dating to the early medieval period in Ireland, roughly between the fifth and twelfth centuries. It would have enclosed a farmstead, its bank and external fosse, or ditch, providing a degree of security for people and livestock. At Lurgan More, the enclosing bank remains visible for much of its circuit, though from the south to the south-west the ground rises into a natural scarp that takes over the job of defining the boundary. The fosse itself survives in legible form from the north-north-east, running through south and around to the west; elsewhere, a change in vegetation marks where it once ran. The several gaps now visible in the bank appear to be modern breaks rather than original entrances, the kind of damage that accumulates quietly over generations of agricultural use.