Cahersiveen, sometimes Cahirciveen, is a town in the south-west of Ireland, in County Kerry. As of the 2022 census, it had a population o…Cahersiveen, sometimes Cahirciveen, is a town in the south-west of Ireland, in County Kerry. As of the 2022 census, it had a population of 1,297. Cahersiveen is on the slopes of 376-metre-high Bentee, and on the lower course of the River Ferta. It is the principal settlement of the Iveragh Peninsula, near Valentia Island. The town is 50 km west of Killarney.