It has no visible presence at ground level. The only reason anyone knows it is there is that a plough broke through the surface and exposed the tell-tale black spread beneath, the residue of repeated burning and quenching that is the signature of a fulacht fia.

A fulacht fia is a type of prehistoric cooking or processing site, typically a horseshoe-shaped mound of fire-cracked stones accumulated beside a water source over many uses. The working method is well understood: stones were heated in a fire and then dropped into a trough of water to bring it rapidly to the boil, leaving behind a growing pile of thermally shattered fragments. The Annamult site fits this pattern closely. It sits in marshy ground with a spring and stream running roughly northeast to southwest about eighty metres to the northeast, providing exactly the kind of reliable water supply these sites required. A second fulacht fia lies approximately a hundred and fifty metres to the north, which is not unusual; such sites often appear in clusters where water and fuel were consistently available across generations.