What remains today is a large subrectangular enclosure sitting within the southern half of an earlier ringwork, its boundaries still traceable as a low, grass-covered bank that has weathered centuries of Irish seasons. The site appears on the 1913 Ordnance Survey map, marking it simply as ‘Doon Castle (Site of)’, a testament to its long-vanished structures.

Archaeological surveys conducted in 1971 revealed the monument’s internal layout, which includes faint traces of an earth and stone bank that once divided the enclosure into separate areas, suggesting a complex defensive or residential arrangement. The site’s significance became clearer through aerial photography taken in July 1966, when oblique images captured the monument’s outline with remarkable clarity, revealing features that might otherwise go unnoticed at ground level.

Though the castle itself has long since disappeared, leaving only these earthwork foundations, the site represents a typical example of Anglo-Norman fortification in the Irish midlands. The combination of a ringwork with later enclosure modifications tells a story of changing defensive needs and possibly shifting ownership through medieval times, making it a valuable piece of Westmeath’s archaeological heritage despite its subtle presence in the landscape today.