"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.
Even when I was a kid, I had a good thing with kids. To this day, if I go to a birthday party with one of my kids, I swear to you, I am so much happier hanging out with my kids and their friends than talking to the grown-ups.