It appears on aerial imagery, consistent across multiple surveys, yet it does not appear on any map. No one, as far as is recorded, has ever set foot on it. The likelihood is that it is a crannog, an artificial or partly artificial island, typically constructed from timber, stone, and brushwood, that served as a defended dwelling place during the early medieval period, though examples in Ireland range from the Bronze Age well into the post-medieval centuries.

The lough itself is S-shaped, and the feature sits towards the southern end of the northern arm, a stretch of water running roughly 650 metres north to south and about 330 metres east to west at its widest. It was first identified not by a ground survey but through careful scrutiny of aerial photography, with the initial report credited to Anne-Karoline Distel. That it has gone unrecorded on cartographic sources for so long is perhaps not surprising; crannogs that have silted up or merged with natural islets can be easy to overlook, and Parisee Lough is not among Cavan's more visited stretches of water. As of late 2022, the site had not yet been visited by researchers, meaning its character, condition, and precise date remain entirely open questions.