"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.
Make no mistake, most women are well aware that they've never had it so good when they enter a spa or salon, it is purely a hair/nails thing, a prelude to an evening of guilt-free fun.