Croghan Hill, Extinct volcano in County Offaly, Ireland

Croghan Hill is an extinct volcano in County Offaly that rises 234 meters above the Bog of Allen. The hill is surrounded by moorland and offers views across the Irish Midlands region.

Croghan Hill was known in Irish tradition as Brí Éile, named for a goddess said to dwell in the summit mound, which is unexcavated and thought to date from the Bronze Age or earlier. The hilltop may have served as the inauguration site of the Ó Conchobhair kings of Uí Failghe. On the eastern slope stand an old graveyard and the remains of an early medieval church named after Bishop Mac Caille, linked to Saint Patrick.

The hill holds a connection to Saint Bridget, a patron saint of Ireland, who according to local tradition was born near its base. This association shapes the local identity and draws visitors interested in Irish saints and their stories.

A marked trail of about 1.8 kilometers circles the hill, with the Croghan Community Centre serving as the starting point for walks. The path is relatively easy to follow and gives a good overview of the surroundings.

The hill is made of basalt, diorite and volcanic ash, the remains of an extinct volcano. From Uisneach, the midwinter sun is seen rising over Croghan Hill, tying the two hills together in the calendar.