This rectangular enclosure, measuring approximately 73 metres from north to south and 55 metres across, was once surrounded by formidable defences; an earthen bank faced with stone, though today only fragments remain visible along the eastern side and southeast corner. The most striking feature that survives is the wide, deep fosse that encircles the monument, its waters still standing at nearly a metre deep in places, just as they would have centuries ago when this site served its original purpose.

What makes this monument particularly intriguing is its complete lack of any causeway or bridge across the water; whoever built this enclosure clearly intended it to be thoroughly cut off from the surrounding landscape. The original defensive system was even more elaborate, with an outer earthen bank that once wrapped around the entire complex, though this has now vanished entirely from the eastern side. The remaining banks on the other three sides offer tantalising glimpses of what must have been an impressive fortification in its day.

First documented by O’Kelly in the early 1940s, the site has since become cloaked in trees, visible today primarily through aerial photography where its distinctive rectangular outline can still be traced. Its location in low, marshy ground was no accident; medieval builders often chose such naturally defensive positions, using the wet conditions to their advantage. While the exact history and purpose of this particular moated site remains something of a mystery, it stands as a remarkable example of medieval earthwork engineering, preserved by the very wetland conditions that once made it so defensible.