"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.
Truth be told, I'm not an easy man. I can be an entertaining one, though it's been my experience that most people don't want to be entertained. They want to be comforted.