"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.
The old fun thing is when somebody typed up the first chapter of War and Peace. And then made a precis of the rest of it and sent it out and only one publisher recognized it.