Others survive only as faint signatures in the soil, invisible from ground level and legible only from the air. At Boherdotia in County Limerick, what may be a ring barrow, a type of prehistoric funerary monument typically consisting of a low central mound enclosed by a circular ditch and outer bank, is detectable not as a physical feature in the landscape but as a cropmark visible on aerial photography.

Cropmarks form when buried archaeological features influence the growth of vegetation above them. Ditches, which tend to retain more moisture, often produce lusher, taller crops, while buried mounds or compacted surfaces can cause stress and patchiness. From directly above, these variations in colour and height trace out the outlines of structures that may have been levelled or buried for centuries. The Boherdotia example was identified from Google Earth aerial photographs and documented by Denis Power, with a record uploaded in September 2013. The notes describe it cautiously as a "possible" ring barrow, reflecting the interpretive uncertainty that comes with cropmark evidence alone. Without ground survey or excavation, the identification remains provisional, though the circular form is consistent with ring barrow morphology found widely across Ireland from the Bronze Age onward.

There is nothing to see at the site itself in the conventional sense. The feature does not protrude above the modern field surface, and without knowing the precise growing conditions and crop type at any given time of year, even a visit during the right season offers no guarantee of visibility. The most productive way to engage with this site is through the aerial images that brought it to attention in the first place. The location sits within ordinary farming country in County Limerick, and the surrounding fields are in private agricultural use. Anyone with a serious research interest would be better served by consulting the relevant Sites and Monuments Record entry and cross-referencing with available aerial photographic archives than by attempting a visit on the ground.