Croghan Mountain is a Marilyn of 606 m in Wexford, Wicklow. Its closest neighbour in this register, Croaghanmoira Mountain, is 14.0 km away.
Its drop of 522 m is 86% of its height: the col linking it to higher ground is only 84 m above sea level. All four of its nearest neighbours are higher, up to Lugnaquillia Mountain at 924.7 m. It is one of only four register hills in the Wicklow Hills S region, with Lugnaquillia Mountain, Croaghanmoira Mountain and Keadeen Mountain. Only four of the 104 hills profiled in Ireland are lower. All four of its nearest neighbours lie to the north, so it stands at the southern edge of its group. On the Marilyns height ladder it sits between Well Hill (606.1 m) and Carran (604 m). The summit is marked by a trig point.
