The circular cropmark, captured in photograph St. Joseph ATB 99, measures approximately 40 metres across and sits in productive farmland just above the lough's shoreline. These telltale marks in the crops often indicate buried archaeological features; differences in soil depth and composition above ancient ditches or walls affect plant growth, creating patterns visible from above.

The site remains uninspected on the ground, its secrets still hidden beneath the soil. Such enclosures, common throughout Ireland, could date from various periods and serve multiple purposes; they might represent prehistoric ringforts, early medieval settlements, or ceremonial sites. The location, positioned on good agricultural land with views across Lough Swilly, would have been attractive to past communities seeking both fertile ground and defensive advantages.

This discovery forms part of the comprehensive Archaeological Survey of County Donegal, compiled by Brian Lacey and his team in 1983. The survey catalogued field antiquities spanning from the Mesolithic period through to the 17th century, documenting the rich archaeological heritage of the county. While technology has advanced considerably since the original survey, these aerial photographs continue to provide valuable insights into Donegal's hidden past, revealing features that might otherwise go unnoticed at ground level.