On a hilltop in County Kildare, at 310 feet above ordnance datum, sits an earthen mound that has quietly accumulated layers of purpose across the centuries. At its summit, where surveyors once fixed an Ordnance Survey trigonometrical station, a concrete water tank has been sunk into the ancient fabric of the mound itself, a functional intrusion that sits incongruously atop something considerably older. The mound is sub-circular in plan, roughly 22 metres across at its base and rising to nearly five metres at its highest point on the south-western side, tapering to just under three metres at the north-east. It is, by any measure, a substantial earthwork.

The mound's origins remain unresolved, but its form is consistent with the kind of early medieval or prehistoric earthen monuments found across the Irish midlands, where such raised structures served ceremonial, funerary, or territorial purposes. What complicates the picture is a feature noted during a site inspection in 1958: an earthen ramp, approximately 36 metres long and 6 metres wide, approaching the mound from the north-west. Surveyors at the time assessed it as not ancient, a later addition rather than a feature of the original construction. That ramp has since been levelled and no longer exists, leaving the mound itself to stand without this awkward appendage. The hilltop position, with its wide views of the surrounding Kildare countryside, would have made the site conspicuous in any era, which may go some way towards explaining why successive generations continued to find uses for it.