"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.
I'm still shy - I'm no good at my children's parent-teacher conferences, and I'm slowly learning how to ask for what I want. But I now know that I have a reserve of courage to draw upon when I really need it. There's nothing that I'm too scared to have a go at.