The subcircular enclosure, measuring 18 metres east to west and 15 metres north to south, is defined by a low earthen bank that has weathered centuries of Atlantic storms. Within this ancient boundary, visitors can find several remarkable features: a cross-inscribed stone, what appears to be a broken cross, a small stone cross, and the rectangular foundation of what was likely a small church, its 5.5 by 4 metre footprint still oriented along the traditional east-west axis.

Just west of the main enclosure, where the land drops away to a rocky platform, two more foundations hint at the site's extended use. One appears circular in plan whilst another rectangular structure lies to its north, with two additional possible building foundations visible to the northeast. These outlying structures suggest that Killoran may have supported a small religious community, perhaps housing monks or serving as accommodation for pilgrims visiting this remote sacred site.

The location itself speaks to the aesthetic and practical considerations of early Irish Christianity. Set on a relatively flat platform amidst rough, rocky terrain, the site commands impressive views along the Donegal coastline. This combination of isolation and visibility was typical of early monastic sites; remote enough for contemplation yet positioned to serve as a beacon of faith to scattered coastal communities. Today, the earthworks and stone remnants at Killoran offer a tangible connection to Ireland's early medieval past, when such modest enclosures served as vital centres of worship, learning and community life.