The enclosure at Reenavanna East is penannular in shape, meaning it forms an almost-closed circle with a deliberate gap, open to the northwest. It measures roughly 24 metres on its northeast-to-southwest axis and 17 metres across. What makes it particularly easy to overlook is that it no longer survives as a standing earthwork you can walk up to and touch. Instead, it has faded into the ground to the point where its clearest portrait is an oval cropmark, the kind of trace that only becomes visible from above when differential growth in grass or crops betrays buried features beneath.

The enclosure was recorded on the Ordnance Survey 25-inch map, which places it on a gentle southeast-facing slope, 320 metres northwest of the Gortnaderagh River. Two water sources appear in close proximity on the same map: a spring 10 metres to the northeast and a well 33 metres further in the same direction. That clustering of a settlement feature with nearby water is a familiar pattern in Irish archaeology, where enclosures of this kind, often associated with early medieval farming and habitation, were typically sited with practical access to water in mind. The monument was compiled in the National Monuments record by Alison McQueen and Vera Rahilly, with the entry uploaded in July 2020. Its visibility as a cropmark was confirmed through Digital Globe orthophotos taken between 2011 and 2013, and again on Google Earth imagery from March 2014.

Because the monument survives primarily as a subsurface feature, a visit to the field itself is unlikely to reward you with an obvious earthwork. The most readable version of this enclosure exists in aerial and satellite imagery rather than on the ground. If you are in the area, the broader landscape along the Gortnaderagh River valley is gently rolling rough pasture, and the slope on which the enclosure sits faces southeast, which means morning light falls across it at a low angle. The spring and well marked on the old OS map to the northeast are worth looking for, as water sources of this kind sometimes preserve older usage in the local placename or in the continued presence of stonework around the source.