It was roughly oval in shape, measuring approximately 46 metres north to south and 56 metres east to west, large enough to have been a significant feature on the landscape. It appears clearly on the first edition Ordnance Survey six-inch map, surveyed in 1839, drawn and recorded with the careful attention that characterised that remarkable mapping project. By the time surveyors returned to revise the same sheet between 1899 and 1902, it was gone, or rather, it had been made to disappear, most likely levelled to make the land more workable for agriculture in the intervening decades.

Enclosures of this kind, broadly circular or oval earthworks defined by banks and ditches, are among the most common archaeological monument types in Ireland, though their purposes varied considerably. Some were raths or ringforts, used as defended farmsteads during the early medieval period. Others served different functions entirely, from ceremonial to pastoral. Without excavation, it is rarely possible to say which category a particular example belongs to, and in this case the enclosure at Bramblestown did not survive long enough into the era of systematic archaeological investigation to be examined in any detail. What the maps do confirm is its approximate size and shape, and the fact that it existed as a visible earthwork into the nineteenth century before agricultural improvement erased it from the ground entirely, leaving only its outline on paper as evidence that it was ever there.