Rainmaker Mountain is one of several giant volcanic mountains that created Tutuila Island. It dominates the scene from nearly every point in Pago Pago Harbor. It compromises three mountain peaks: North Pioa, South Pioa, and Sinapioa. The peaks range in elevation from 1,619-1,718 feet. The 170-acre designated landmark area occurs above the 800-feet contour line. Several endemic species are only present here and on Matafao Peak, the highest point on Tutuila.