This rectilinear enclosure once stretched approximately 33 metres from east to west, though time and human activity have taken their toll; the entire southern half has been quarried away, leaving only the northern portion to tell its story. The Kilshanvy River flows quietly past to the east, much as it would have done when this fortification was actively occupied centuries ago.

The fort’s defensive architecture can still be traced through its surviving earthworks, which consist of two banks with a fosse, or defensive ditch, running between them. These features are best preserved at the northwestern corner, where visitors can get a sense of the original construction. The fosse and outer bank are particularly visible here, offering clues about the fort’s defensive capabilities. A gap in the western section likely marks where the original entrance stood, allowing controlled access to the interior of the enclosure.

Within the fort’s interior lies a cashel, catalogued as GA028-032001, which adds another layer of archaeological interest to the site. Cashels, stone-built circular enclosures, were typically used as fortified farmsteads in early medieval Ireland. The presence of this structure suggests the site may have had a long period of occupation or potentially multiple phases of use. While much of Knockaunpastia Fort has been lost to quarrying, what remains provides valuable insights into the defensive strategies and settlement patterns of ancient Galway.