Where a circular earthen bank once enclosed a household and its outbuildings, the levelled ground still betrays itself in dry weather as patches of lighter growth, the buried archaeology subtly changing what the soil holds and how the turf above it behaves.

A ringfort, known in Irish as a ráth when built from earth, was the standard form of enclosed settlement in Ireland from roughly the fifth to the twelfth century. Tens of thousands were constructed across the country, most enclosing a single family's dwelling and associated structures within a raised bank and ditch. This example at Castlehaven measured approximately twenty-five metres in diameter, placing it at the smaller end of the scale. It was recorded on the Ordnance Survey six-inch map of 1842, where a cartographer noted the circular enclosure with hachures, the short radiating lines used to indicate an earthwork or raised feature. By the time of any modern inspection, the bank itself had been levelled entirely, leaving only that subtle chromatic signature in the field.