This is the crannog at Derrinlough, a site that presents itself to the casual eye as almost nothing at all, yet conceals, just a quarter of a metre below the surface, an engineered platform of sandstone pebbles laid by human hands.

A crannog was an artificial, or partly artificial, island, typically constructed in a lake and used as a defended settlement, most commonly from the early medieval period onwards. The lake that once surrounded this example was drained roughly thirty years before the site was recorded, leaving the former island stranded in flat, reclaimed land. Despite poor surface conditions, the landowner reported that beneath the sandstone pebble layer lies more than two metres of compressed organic material, mainly thin branches, the kind of dense timber and brushwood foundation that builders of crannogs used to create stable platforms on soft lake-beds. One piece of wood, embedded to a depth of around 0.4 metres, may be a structural stake driven in to anchor or reinforce the platform. Animal bones have also come to light, the ordinary domestic debris of people who once lived and ate here. Perhaps most striking among the finds recovered nearby are a polished stone axehead and a rubbing stone for a saddle quern, a flat grinding stone used to process grain, both of which suggest activity stretching back considerably earlier than the typical medieval crannog occupation, possibly into prehistory.