It measures roughly fourteen metres east to west and twelve metres north to south, rising only half a metre above the surrounding marshy ground. That modest profile, however, is characteristic of a crannog, an artificial or partly artificial island dwelling that was a common form of settlement in Ireland from the Bronze Age through to the early modern period. Built from layers of timber, peat, brushwood, and stone, crannogs were essentially fortified homesteads set in water, offering their inhabitants both a degree of protection and a commanding view of the surrounding land.

Drumgoast Lough itself is small, its longest dimension running about 230 metres north to south and perhaps 130 metres east to west. The crannog sits tucked against its north-eastern shore, half consumed by the boggy ground that has crept in around it over centuries. The stony mound is now heavily overgrown, which is not unusual; many Irish crannogs survive in exactly this condition, their original construction materials compressed and buried beneath accumulated vegetation and sediment. Without excavation, it is difficult to say when this particular example was built or occupied, and the available record offers no such detail. What remains is a quiet, sodden outline in a quiet, sodden landscape, persisting largely because nobody has had much reason to disturb it.