Nearly fifteen metres across at its longest and almost a metre high, the mound has a wide opening facing north-north-west, and another of the same type of monument lies just twelve and a half metres to the west.

This is a fulacht fiadh, a class of prehistoric cooking or processing site found in enormous numbers across Ireland, particularly in low-lying or waterlogged ground close to water sources. The typical interpretation is that stones were heated in a fire and then dropped into a water-filled trough, bringing the water rapidly to a boil for cooking meat or, according to some researchers, for other purposes such as textile processing or bathing. The burnt and shattered stones that resulted from repeated heating and quenching were raked aside, accumulating over time into the characteristic horseshoe or kidney-shaped mound that survives today. The form here at Rowls Noonan, kidney-shaped with a broad opening, is entirely consistent with that pattern, and the presence of a second example so close by suggests the location was returned to, or that the site saw more than one phase of activity.