This stone and earthen ringfort forms a roughly rectangular platform measuring about 11.3 metres north to south and 12.3 metres east to west. The enclosing bank, which incorporates natural bedrock in several places, still stands up to half a metre high in parts, whilst the platform itself rises approximately one metre above the surrounding ground level.

The interior of this defensive structure is remarkably flat, suggesting careful preparation of the site during its construction. Cashels like this one were typically built as fortified homesteads during Ireland's early medieval period, serving as both residences and defensive structures for local families of some standing. The choice of an island location would have provided natural protection, with the water acting as an additional barrier against potential raiders or unwanted visitors.

The site was documented in the Archaeological Survey of County Donegal, compiled by Brian Lacey and his team in 1983, with updates added in 2008. Whilst many ringforts and cashels dot the Irish landscape, this particular example is notable for its island setting and the way it maximises the limited space available, transforming nearly the entire island into a fortified dwelling place.