No earthworks break the soil, no walls hint at what is below. The site at Killeek exists only as cropmarks, that is, patterns in growing crops or soil discolouration that betray buried features beneath, showing up when viewed from the air under the right conditions. In this case, the right conditions turned out to be a Saturday afternoon on satellite imagery: the outlines emerge most clearly on Apple Maps photography from June 2018, where the trio of roughly circular forms appear as positive cropmarks against the surrounding arable land.

The enclosures sit approximately 120 metres south of the Ward River, in a field that gives no obvious ground-level indication of anything beneath it. There are three in total, all subcircular in plan, and they are arranged in a conjoined grouping rather than sitting in isolation. The largest, positioned to the south of the group, measures roughly 47 metres north to south and 58 metres east to west, defined by a ditch approximately 3 metres wide. Concentric within it sits a smaller enclosure, around 33 by 30 metres, defined by a narrower ditch of about 1 metre in width. A third enclosure, with dimensions close to 30 by 32 metres and a ditch again around 3 metres wide, projects outward from the northern and north-eastern perimeter of the primary enclosure. The concentric arrangement of the inner and outer southern enclosures is particularly notable; this kind of nested layout is associated in Ireland with enclosed settlements of early medieval date, though without excavation the age of the Killeek enclosures remains unconfirmed. The site was recorded by archaeologist Tom Condit and uploaded to the record in April 2021.

Because nothing is visible at ground level, a visit to Killeek requires a different kind of attention than most archaeological sites. The field itself, lying south of the Ward River near the townland of Killeek in Fingal, is arable and actively farmed, so access would need to be arranged with the landowner. The more practical approach is to examine the satellite imagery directly: pulling up Apple Maps or Google Earth and navigating to the area with imagery from June 2018 gives a reasonable view of the cropmark outlines. The June timing is worth noting, as cropmarks of this kind tend to show most strongly during dry summer conditions when buried ditches, which retain moisture differently from the surrounding soil, produce contrasting growth in whatever crop is above them.