The oval spread, roughly 12 metres by 7 metres, is otherwise invisible beneath the surface, one of two such features in close proximity on this gentle west-facing slope. Its neighbour lies about 40 metres to the south-south-east, suggesting this small corner of Wexford was once a place of repeated, deliberate activity rather than a single isolated event.

Burnt mounds are among the more quietly puzzling monuments in the Irish archaeological landscape. They are typically Bronze Age in origin and are thought to relate to the heating of water, most likely by dropping fire-heated stones into a trough or pit. The process cracks and blackens the stones, and over time the discarded rubble accumulates into a low, often crescent-shaped or oval mound. The proximity of water seems almost always to be a factor, and the Nash site conforms to that pattern: the headwaters of a small north-south stream run approximately 180 metres to the west. What exactly these sites were used for, whether cooking, bathing, textile processing, or some combination, remains a matter of ongoing discussion among archaeologists, but their association with water and heat is consistent enough to be considered a defining characteristic.