There is no mound, no obvious structure, no dramatic feature to draw the eye. What remains is essentially a stain in the soil, the residue of an ancient practice that was once extraordinarily common across Ireland.

A fulacht fia is a type of Bronze Age cooking site, typically consisting of a trough that would have been filled with water, heated by dropping fire-cracked stones into it until the water boiled. The spent, shattered stones were piled to the sides over time, forming the characteristic horseshoe-shaped mounds that survive at thousands of sites across the country. At Tooms, the land has long been under cultivation, and the plough has flattened whatever mound once existed, scattering the burnt and broken stone through the topsoil of the field. This kind of truncation is common where tillage has continued over generations, and it means that the archaeological deposit survives only as a spread rather than as an intact monument. The function of fulachta fia has been debated; cooking is the most widely accepted explanation, though some researchers have proposed uses related to bathing, textile processing, or other communal activities requiring large quantities of hot water.