The monument at Creevy in County Longford does the opposite. Where a conventional barrow rises from the ground, a pond barrow sinks into it, creating a concave central depression enclosed by a low surrounding bank. The effect is less a grave and more a shallow bowl pressed into the landscape, which is precisely what makes the type so easy to overlook and so quietly peculiar once you know what you are looking at.

The Creevy example sits on a gentle north-east-facing slope. Its central hollow measures around twelve metres across at its base and drops to as much as 1.3 metres below the surrounding ground level at the south-south-east, shallowing toward the north-north-east. Around this depression runs a wide, low bank of earth and stone, heavily denuded over time, with a base width of over thirteen metres but standing only around twenty centimetres high today. Beyond that bank lies a wide, shallow external fosse, the kind of ditch that would originally have defined the monument's outer edge. The overall structure spans nearly thirty-one metres at its widest point. What it contained, and when it was built, is unknown; pond barrows as a class are poorly understood, and genuinely rare in the Irish midlands. Fifty-five metres to the south-west stands a solitary standing stone, and roughly 840 metres to the west-north-west lies a stone circle, suggesting that this part of the Longford landscape was once a focus of prehistoric activity rather than an isolated curiosity. A comparable monument has been recorded at Ballybrien in the neighbouring county, which at least confirms that Creevy is not entirely without parallel, even if both sites remain imperfectly explained.