Clomantagh Hill, Mountain summit in Slieveardagh Hills, Ireland

Clomantagh Hill is a mountain summit in the Slieveardagh Hills in County Kilkenny that rises to 349 meters. The slopes feature limestone formations at lower elevations, while the peak exposes sandstone rock with open views across the surrounding terrain.

Clomantagh Hill lies in the townland of Clomantagh (Mt Garrett) in the parish of Balleen, County Kilkenny. The summit reaches 349 m (1,145 ft), the highest point of the northern Slieve Ardagh Hills and the third highest in the county; it is classed as a Marilyn and the 972nd highest summit in Ireland. Its Irish name, Cnoc na Cloiche Mantaí, means hill of the gapped stone.

The name Clomantagh Hill translates from Irish as "hill of the gapped stone", while the summit is also known as Killoshulan. Spahill, the eastern part of the same protected area, is Cnoc na Spá in Irish. The townland is recorded as Clomantagh (Mt Garrett) in the parish of Balleen.

Clomantagh Hill lies in the townland of Clomantagh (Mt Garrett) in the parish of Balleen, County Kilkenny, within a Special Area of Conservation. The summit reaches 349 m (1,145 ft), the highest point of the northern Slieve Ardagh Hills and third highest in the county. Limestone ledges and flat sheets show on Spahill to the east, while low sandstone rocks appear at the summit.

This location is designated as a Special Area of Conservation, protecting rare grassland communities and several orchid species that grow in the base-rich soil. Walkers may spot these flowering plants during their visit, especially if they explore the lower slopes where conditions favor plant growth.