The ground gives nothing away. No raised bank, no obvious depression, no scatter of stone. The only way to read it is from above, where satellite imagery reveals a faint cropmark tracing its curved outline into view.

Cropmarks appear when buried features, walls, ditches, or filled pits, affect the growth of the vegetation above them. Soil disturbed by an ancient ditch tends to retain more moisture, producing slightly lusher or taller crops that photograph as a darker band from the air. The circular earthwork at Lisrevagh came to notice through Google Earth orthoimages and a Digital Globe orthophoto captured between 2011 and 2013, with an earlier Google Earth image dating to March 2010 also showing the trace. A Lidar scan, which uses laser pulses to map subtle variations in ground surface elevation, added further detail. The site has a diameter of approximately 31 metres, placing it within the general range of a ringfort, the type of enclosed farmstead built across Ireland from the early medieval period onwards, though no excavation or ground survey has confirmed what this particular feature actually is or when it was made.