The site in question was a fulacht fia, a type of ancient outdoor cooking monument found in enormous numbers across Ireland, typically comprising a horseshoe-shaped mound of fire-cracked stone and charcoal-dark earth beside a trough or water source. At Raheen Oughter, two low mounds sat in low-lying marshy ground, roughly sixty metres north of a stream, the wet, boggy setting being entirely characteristic of these sites, which depended on ready access to water.

When archaeologists inspected the site in October 1982, they found the two mounds sitting about a metre apart. The northern mound was the better preserved of the pair, measuring roughly 4.7 metres east to west, 2.6 metres north to south, and half a metre in height. The southern mound was smaller and more degraded, around 3.5 metres by 1.8 metres and only 0.3 metres high. Both were composed of the blackened earth and heat-shattered stone that are the hallmarks of fulachta fia, the result of repeatedly heating stones in fire and plunging them into water to bring it to a boil. What makes the Raheen Oughter grouping particularly interesting is its density: two further fulachta fia were recorded nearby, one roughly twenty metres to the south and another about seventy-five metres to the south-west, suggesting this marshy stretch of Galway landscape was returned to again and again for what may have been communal activity over a long period.

By the time aerial photography was examined in more recent years, a house had been built directly over the main site, quietly erasing what had survived into the early 1980s. The two neighbouring monuments to the south and south-west may yet remain, though their condition is unrecorded here.