"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.
It helps, I think, to consider ourselves on a very long journey: the main thing is to keep to the faith, to endure, to help each other when we stumble or tire, to weep and press on.