The site at Teerovannan sits on a low but naturally prominent rise amid gently undulating improved pasture, the kind of modest knoll that would have made it conspicuous in an earlier landscape. An oval earthwork, measuring roughly 30 metres north to south and 23 metres east to west, was recorded on the 25-inch Ordnance Survey map, though by the 1921 edition of the OS 6-inch map a field boundary had already cut across the north-western sector. Today, a concrete silage slab, approximately 18 metres by 6 metres and sunk about 1.8 metres into the eastern half of the site, dominates the interior, currently storing round bales. A pile of manure and old silage wrappings obscures the eastern exterior. Whatever form the enclosure originally took, whether a ringfort-style earthwork used for settlement or livestock, or something earlier, it has been effectively buried under the practical demands of modern farming.

The story of how the site reached this condition involves at least two distinct phases of disturbance. The limekilns recorded on the 25-inch OS map, situated roughly 10 metres to the east-south-east of the enclosure, point to a period of lime production in the area. Limekilns were stone-built furnaces used to burn limestone into quicklime, which was then spread on fields to improve acidic soils, a common agricultural practice from the eighteenth century onward in rural Ireland. Their proximity to the knoll raises the possibility that the rise itself may have been partially quarried for limestone before the silage infrastructure was ever installed, meaning the enclosure could have suffered two separate rounds of attrition. The knoll's natural geology, and the convenience of the rise as a source of stone, may have made it a target long before anyone thought to pour concrete.