"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.
My friends never talk to me about my poetry because they're embarrassed that I write it or they're embarrassed by what I write about which are not such extraordinarily terrifying things, but they are the state of human existence.