"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.
Honesty is the cruelest game of all, because not only can you hurt someone - and hurt them to the bone - you can feel self-righteous about it at the same time.