"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.
What is ominous is the ease with which some people go from saying that they don't like something to saying that the government should forbid it. When you go down that road, don't expect freedom to survive very long.