This rectangular earthwork enclosure measures approximately 45.5 metres from east to west and 50.6 metres from north to south, its boundaries marked by two substantial earthen banks that still rise to impressive heights; up to 1.6 metres on the interior side and 2.3 metres on the exterior. Between these parallel banks runs a fosse, or defensive ditch, which remains waterlogged on the northern, eastern, and western sides, preserving something of its original defensive character.

The site has seen better days, with portions of the protective banks removed along the northern and eastern sides, as well as in the southwest corner. Despite this damage, the basic form of the enclosure remains clearly visible, though the interior is now level and overgrown with vegetation. Such moated sites were typically constructed during the 13th and 14th centuries, often serving as fortified farmsteads for Anglo-Norman settlers or prosperous Irish families who adopted this defensive architectural style.

These earthwork enclosures represent an important chapter in Irish medieval history, marking the landscape with evidence of how communities once protected their homes and livestock. The waterlogged fosse at Killavarrig would have served both as a defensive barrier and possibly as a source of fish, whilst the raised banks provided both protection and a vantage point for observing the surrounding countryside. Though now quiet and overgrown, this site once bustled with the daily activities of medieval life, from farming and craftwork to the constant vigilance required in those uncertain times.