"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've been through the process qualifying for the World Cup, which is an amazing, two-year process. It was an honor to represent the U.S. And to represent the city of Los Angeles and California.