A souterrain is an underground stone-lined passage or chamber, typically constructed during the early medieval period in Ireland, roughly between the sixth and twelfth centuries. They are found in their hundreds across the country, often associated with ringforts or early settlement sites, and their precise purpose has long been debated: cold storage, refuge, or simply a place to keep things out of sight and reach.

What makes this particular example somewhat elusive is that the documentary record currently available says very little about it beyond its location and classification. The townland name itself offers a small clue to the broader landscape: Knockmore, from the Irish Cnoc Mór, meaning big hill, suggests elevated ground, the kind of terrain where early communities often chose to settle and where the archaeology of daily life still occasionally surfaces. Oughter, from Uachtar, meaning upper, further points to a position on higher ground within a divided or layered landscape. Whether the souterrain here sits within the remains of a wider settlement complex, or stands in relative isolation, remains to be established from the fuller record.