The platform measures just three metres in each direction and rises only half a metre above the surrounding ground, but what makes it quietly arresting is where it sits and what it implies: this was originally in about a metre of water, roughly ten metres out from the ancient shoreline of Lough Ennell in County Westmeath. The lake has since retreated, leaving the feature stranded on what used to be its own lakebed, scattered with large irregular limestone slabs up to one and a half metres long.

The platform sits on the south side of Rochfort Bay, on the south-eastern edge of a small inlet, with ground rising to a ridge to the south. It was first formally identified by Karkov and Ruffing in 1990 and 1991 as part of a cluster of rock platforms along the eastern shoreline of the bay, and subsequently described in detail by Aidan O'Sullivan in 2004. Its precise origins remain unresolved, though it is considered a possible prehistoric or early medieval construction. The strongest clue to its context lies nearby: a crannóg, the Irish term for an artificial or modified island used as a dwelling place, sits approximately 420 metres to the north at Goose Island. The Goose Island crannóg is early medieval in date, and the rock platform may well have been part of the same broader network of lakeshore and lake-based activity. A mound associated with Rochfort Demesne lies some 550 metres to the east, adding further weight to the sense that this stretch of Lough Ennell was once a busy, carefully used landscape.