"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 government and media and all of us in the Australian tribe got together, and the rock industry, we'd just be the greatest cultural force the world has ever seen - we're such an amazing race.