"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.
Our language has wisely sensed the two sides of being alone. It has created the word loneliness to express the pain of being alone. And it has created the word solitude to express the glory of being alone.