The site, which enjoys good views across the undulating landscape, consists of a sub-rectangular levelled area measuring approximately 60 metres north to south and 20 metres east to west. What remains visible today is defined by a scarp along its southern and eastern edges; this earthen bank stands roughly 0.9 metres high and spans nearly 8 metres in width.

The castle itself appears to have vanished from the landscape, leaving only these subtle traces in the earth. However, modern technology has revealed more than meets the eye. Aerial photographs taken between 2011 and 2013 show distinct cropmarks outlining a rectangular enclosure at the site. These marks, visible only from above when conditions are right, may represent either the foundations of Castle Erkin itself or, more intriguingly, the remains of a bawn; a defensive wall that would have surrounded and protected the castle during Ireland's tumultuous medieval period.

Archaeological surveys conducted in 2005 documented these features in detail, adding another piece to the puzzle of Ireland's castle landscape. While Castle Erkin may not boast the towering walls of better-preserved fortifications, its earthworks tell a story of strategic positioning, defensive planning, and the eventual abandonment that befell so many of Ireland's medieval strongholds. The site stands as a reminder that history often lies hidden just beneath the surface, waiting to be discovered through careful observation and modern archaeological techniques.