"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.
The long, cold Minnesota winters instilled in me a fascination for exotic far off places I aspired toward a career in tropical diseases and world health problems.