In a field in Srowland, County Kildare, there is no visible monument, no stone, no earthwork, nothing that would cause a passer-by to slow down. The only way to see what lies there is to look from above, and even then only under the right conditions. A bivallate enclosure, meaning a roughly circular enclosure defined by two concentric banks or ditches, lurks beneath the surface, betraying itself not through anything you could touch but through the behaviour of the crops growing over it. Where buried ditches hold more moisture, the plants above them grow taller and greener; where buried banks compact the soil, growth is stunted. From altitude, these subtle differences in vegetation resolve into a ghostly ring, a double outline pressed into the earth like a watermark.

The enclosure at Srowland came to notice through aerial photography, specifically through a Google Earth orthoimage and a Digital Globe orthophoto taken between 2011 and 2013, with a further Google Earth image captured in July 2019 confirming the feature. The internal diameter is approximately 40 metres. Enclosures of this general type are associated in Ireland with the early medieval period, when ringforts served as the basic unit of rural settlement, though some examples have earlier or later origins. A bivallate form, with its double circuit, is generally considered to indicate higher status than a single-ditched example, suggesting that whoever occupied this site held some local significance. The record was compiled by Caimin O'Brien, drawing on details provided by Jean-Charles Caillère, and uploaded in November 2020.