The site is substantial, roughly rectangular in shape, measuring around 87 metres on its longer axis and 60 metres across, which gives it a quiet, expansive quality unusual for a rural parish burial ground.

The graveyard is associated with St. Annin's Church, and when it was inspected in July 1983, numerous grave-markers and graves were still visible, the bulk of them dating to the eighteenth and nineteenth centuries. By that point the site had accumulated the kind of dense, layered vegetation that tends to gather around old burial grounds over decades of low-key maintenance. When the site was revisited in March 2020, that character had changed noticeably: a graveyard clean-up had removed most of the vegetation within it. Such clearances are common enough across Ireland and often prompt divided responses, with some welcoming the legibility they bring to individual stones and others mourning the atmospheric overgrowth and the habitat it supports. What remains at Killannin is the physical record of a community's dead across roughly two centuries, arranged around the shell of the church with which they would have had, in life, a direct and ordinary relationship.