It is a ring barrow, a type of prehistoric burial monument consisting of a central mound or platform enclosed by a circular ditch, known as a fosse, and an outer earthen bank. The Boveen example is a substantial one: the domed interior measures roughly 51 metres in diameter, with the fosse running to about 6 metres wide, and the outer bank rising to 0.7 metres above the surrounding ground. These are not dramatic numbers on paper, but walking the circuit of such an earthwork, you are tracing a boundary that was deliberately constructed, most likely during the Bronze Age, to separate the space of the dead from that of the living.

By the time the Ordnance Survey mapped this part of Offaly in 1840, the monument had already lost much of its legibility. The surveyors recorded it as an irregularly shaped earthwork, the symmetry of the original ring obscured by centuries of agricultural use and natural wear. That process of slow absorption into the working landscape has continued: the western side of the outer bank has been pressed into service as a field boundary, while the south-eastern sector of both the fosse and the bank has been destroyed altogether. What survives is a partial monument, enough to read the original design but carrying the marks of every generation that farmed around and over it without necessarily understanding what it was.