"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.
To dare to live alone is the rarest courage since there are many who had rather meet their bitterest enemy in the field, than their own hearts in their closet.