Walking through the flat tillage fields near Courttown in County Kildare, there is nothing visible to suggest that the ground beneath holds any trace of the past. No mound, no hollow, no displaced stone. What survives here exists only as a cropmark, a ghostly outline that becomes legible solely from the air, when differences in soil moisture and crop growth betray the presence of buried features below. This particular site is a ring-ditch, a roughly circular form defined by two fosses, or ditches, running concentrically. Ring-ditches of this kind are generally understood to be the ploughed-down remains of prehistoric funerary or ceremonial monuments, the earthworks themselves long since levelled, leaving only their cut features pressed into the subsoil.

The ring-ditch at Courttown was identified in 1996 by Dr. Gillian Barrett during an aerial photographic survey, appearing on photograph GB96.FZ.10 as a clear cropmark. What makes the find especially interesting is its context. This is not an isolated anomaly but one of a dense cluster of levelled monuments spread across a roughly rectangular area of around 650 metres east to west and 350 metres north to south, all within the same level farmland. Additional outlying cropmarks appear some 250 metres to the south and another roughly 220 metres to the north-west, suggesting a landscape that was once far more intensively marked by human activity than its present appearance would imply. The concentration was pieced together from multiple aerial sources, including surveys by Dr. Barrett, the Cambridge University Collection of Aerial Photographs, and the Geological Survey of Ireland.