This rectangular earthwork sits on slightly elevated ground, measuring roughly 38 metres from northeast to southwest and 35 metres from northwest to southeast. The site's most distinctive feature is the moat that remains visible along its southwestern edge; a water-filled ditch that's 6 metres wide and 2 metres deep, though time has erased traces of what was likely once a complete defensive circuit.

The raised platform is surrounded by wooded terrain and defined by earthen banks, though these may be more recent additions to the landscape. A small stream rises about 50 metres to the northeast, its headwaters flowing southeast to northwest through the undulating topography. On the northeastern side, a narrow entrance gap of just 1.5 metres provides access to the interior, marking what would have been the original entry point to this fortified homestead.

Sites like Lacken represent a widespread settlement pattern across medieval Ireland, where Anglo-Norman colonists and Gaelicised families built these moated farmsteads between the 13th and 14th centuries. The combination of natural elevation, water defences, and earthen banks created a practical defensive system for rural landholders who needed protection but couldn't afford stone castles. Today, the site stands as a subtle but significant reminder of how medieval communities adapted to Ireland's landscape, using earth, water, and timber to create secure homes in an often uncertain world.