There is no mound to speak of, no hollow in the turf, no surface feature to suggest that anything lies beneath. It is, in the plainest sense, invisible.

A fulacht fia is a type of prehistoric cooking site found in considerable numbers across Ireland, typically Bronze Age in origin. The usual form involves a horseshoe-shaped mound of burnt and shattered stone surrounding a trough, which would have been filled with water and heated by dropping fire-cracked stones into it. Thousands of these sites survive across the country, though many, like the one at Curraghadobbin, are known only because someone looked carefully enough. In this case, that person was Will Forbes, whose identification of the monument placed it on the archaeological record despite its complete absence as a surface feature.