The enclosure at Kilpatrick in County Westmeath has been recorded as heptagonal on one map and oval on another, and from the air it reads as oblong entirely. The 1837 Ordnance Survey six-inch map shows a distinctly seven-sided form; by the time the 1913 twenty-five-inch edition was produced, the same feature had been rendered as an oval earthwork. Whether the surveyors were interpreting a genuinely ambiguous outline or whether erosion had softened earlier angles in the intervening decades is difficult to say, but the discrepancy gives the site an oddly slippery quality, as if it resists easy categorisation.

When the monument was formally described in 1980, it measured roughly 63 metres north to south and 36.5 metres east to west, enclosed by a low bank and an outer fosse, which is the term for the ditch that typically accompanies an earthen enclosure. The bank survives best along the south and south-west, though it has been broken in numerous places by livestock moving across it over the years. The fosse, where it can still be traced along the north-northwest, is narrow and shallow, much reduced from whatever depth it once held. One of the more intriguing details is the absence of any obvious entrance gap, which makes the original function harder to read. The interior is not flat; it rises unevenly towards the centre and retains faint cultivation ridges running north to south, suggesting that at some point the enclosed ground was worked as agricultural land. Old field banks and drains pass the site on both sides, weaving it quietly into a broader pattern of land use that has left its own marks on the surrounding pasture.

The site sits on a low rise in rough, undulating ground, and while the higher terrain around it limits the view in most directions, there is a notably open prospect to the northwest. The earthwork itself is most legible from aerial photography, where its oblong outline emerges clearly from the surrounding fields, though on the ground the surviving bank, particularly along the southern arc, still gives a reasonable sense of the enclosure's original scale.