"Ahu" are stone platforms on which many moai sit. There are 313 known ahu and 125 of these carry moai. The biggest, Ahu Tongariki is 220 m (720 ft), and had the most (15) and tallest moai.
There is no enemy like a yajna (sacrifice) which consumes the kingdom when not attended by feeding on a large scale; consumes the priest when the chanting is not done properly; and consumes the yajaman (the responsible person) when the gifts are not made.