"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.
Mount Gimie is Saint Lucia's highest mountain, standing over 3,000 feet tall. Saint Lucia has more mountains than most other Caribbean islands, and was formed as a result of volcanic activity.