National Natural Landmark VI
VI. Site: Rainmaker Mountain, Tutuila, American Samoa
Description: Rainmaker Mountain is stepped in Samoan lore and legend. It towers high above beautiful Pago Pago from a massive base. The Samoan name for Rainmaker Mountain is Mount Pioa but on a detailed United States Geological Survey Map, three peaks are identified. These peaks are north Pioa, south Pioa and Sinaipioa Mountains. The crests of these three peaks range in elevation from 1600 to 1700 feet above sea level. Despite the site’s proximity to Pago Pago, its vegetative cover from a hundred feet above the surface of the sea is unspoiled. The 170-acre landmark site, which consists of the area above the 800-foot contour line, is located just east of Pago Pago Harbor.
Significance: Rainmaker Mountain is unsurpassed as an example of the several gigantic volcanic plugs associated with as many as five eruptions along the enormous Tutuila Island fissure zone, which created the island. Rainmaker Mountain is clearly a key feature associated with the major episodes of volcanism in the Samoan region.