The "haystacks" are actually a hilltop outcrop of large granite boulders with walkways between them. Local legend has it that an Irish agricultural expert advocated that to produce good hay, farmers should harrow their land. While traveling past in a coach, he noticed the rocks (technically called inselbergs) and told his fellow passengers that the famer had obviously harrowed his land to produce such good haystacks. The farmer in question was Murphy. It's a nice spot for a picnic.