"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.
If they can prove that I am wrong by that time, I will give it up to their wisdom, but not after to any one's judgment, till I see the end of another year for the Lord will begin with a new century and I will see what he will do, before I will hearken to any man's judgment.