"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 in high school, I'd tell my mom I was sick of swimming and wanted to try to play golf. She wasn't too happy. She'd say, 'Think about this.' And I'd always end up getting back in the pool.