Ailsa Craig is also known as "Paddy's Mile Stone" as it lies halfway between the cities of Glasgow and Belfast. As well as being a local landmark and a well known marine navigational hazard the island is a protected bird sanctuary, sheltering thousands of breeding pairs of sea birds.
Located midway between Glasgow and Belfast, Ailsa Craig is renowned as "Paddy's Mile Stone," not only standing out as a prominent local feature but also posing a significant threat to navigation, while it serves as a sanctuary for thousands of seabirds during their breeding season.