It consists of an oval enclosure, 350 metres (1,150 feet) across at its widest point, surrounded by two concentric ditches. Inside the enclosure another ditch encloses an area 150 metres (490 feet) in diameter. Archaeological excavation shows that it was occupied in the late Bronze Age, ca. 1100 to 900 BC, after which it was abandoned, although some artefacts discovered were of Iron Age date, suggesting that it was later reoccupied. It was contemporary with the nearby artificial pool known as the King's Stables but was abandoned before Navan Fort, 0.6 miles (0.97 km) to the east, was occupied.