"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.
I know no subject more elevating, more amazing, more ready to the poetical enthusiasm, the philosophical reflection, and the moral sentiment than the works of nature. Where can we meet such variety, such beauty, such magnificence?