Castletownbere is a small town in County Cork in Ireland. It is located on the Beara Peninsula by Berehaven Harbour. It is also known as Castletown Berehaven. The name of the town comes from the no longer extant MacCarty Castle, and not Dunboy Castle which was home to the O'Sullivan clan. The area is the setting for Daphne du Maurier's 1943 novel Hungry Hill named for the mountain of the same name which is the highest peak in the Caha Mountains.