The parish of Kilcronaghan lies on the descending slope of Slieve Gallion (from ga Sliabh gCallann, meaning 'mountain of the heights'), with its highest point lying in the townland of Gortahurk, above sea level. From here it slopes downwards to low gravelly hills, which predominate in the parish. This series of hills become more broken and irregular as they approach the River Moyola.