"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.
My mother, brave woman, lost her whole family when she decided to marry a black man in the '60s. When the marriage fell apart, she had to come back to her family.