But in Ballymurragh West, the rushes are growing in something specific: the waterlogged fosse of a prehistoric ring barrow, a circular monument whose low earthen bank still describes almost perfect dimensions after what may be several thousand years of quiet agricultural life around it.

A ring barrow is a burial monument, typically from the Bronze Age, consisting of a central area enclosed by a ditch, known as a fosse, and an outer bank of upcast earth. The example recorded here by Denis Power sits on the south-south-west-facing slope of a low hill, the kind of modest elevation that Bronze Age communities often chose for their funerary monuments, perhaps for visibility, perhaps for drainage, perhaps for reasons we can no longer reconstruct. The recorded measurements are precise: the enclosed interior runs 12.3 metres north to south and 11.9 metres east to west, giving it a nearly circular plan. The fosse itself is 1.95 metres wide and still 0.35 metres deep despite centuries of silting, and the external bank retains an internal height of 0.6 metres. What is particularly notable is the presence of two causewayed entrances, placed in opposition at the east and west. Each causeway is a deliberate gap left in the fosse, wide enough for a person to pass, and their alignment suggests the monument was oriented along a roughly east-west axis, which would not be unusual for a site associated with the movement of the sun.

The monument survives in rough pasture, with a field boundary running along the northern edge of the bank. The interior is level and partially waterlogged, which has actually helped preserve the earthworks by discouraging deep ploughing. The rushes growing in and around the fosse are a practical guide to where the monument is wettest, and the stand of rushes in the fosse itself marks its course quite clearly even from a short distance. The site is not managed or signposted as far as the available records indicate, so any visit depends on identifying the correct field and, where applicable, seeking landowner permission in the usual way.