A pitted basalt boulder on the north coast that the old Rapa Nui used as a musical instrument: blow across one of the holes and a deep horn-like note travels for kilometres. The stone is named after the god Hiro, who in Polynesian myth was associated with rain and the sea. Fishermen are said to have used the trumpet to call schools of fish into shore, and the dull boom would also have served to summon people for ceremonies.
The stone sits beside the road between Anakena and Te Pito Kura with no signage other than a small marker. Visitors are no longer encouraged to blow into the holes — the sound is famous but the erosion is irreversible — but the spot is a curious five-minute stop.