The mound is roughly eighteen metres long and ten metres wide, oriented east to west, and carries a slight depression set off-centre toward its eastern end. That hollow is the telling detail. It is the kind of feature associated with burnt mounds, a class of site found widely across Ireland and Britain, typically interpreted as the debris left by repeated episodes of fire-heating stones and dropping them into a water-filled trough to boil liquid. Over time, the cracked and shattered stones, blackened and fire-reddened, were raked out and piled up, forming exactly the kind of low, spreading mound visible here.

Burnt mounds are among the more quietly puzzling monument types in the Irish archaeological record. They date broadly to the Bronze Age, roughly 2000 to 500 BC, though their precise purpose has long been debated. Cooking is the most commonly accepted explanation, but some researchers have suggested uses ranging from hide-processing to bathing. The depression at Blanchvillespark, displaced about four metres from the eastern edge of the mound, may represent the position of the original trough around which the debris accumulated. The site is described as a possible burnt mound, a cautious designation reflecting that without excavation, the full character of the deposit cannot be confirmed.