Tutuila with its 140 sq km is the largest and the main island of American Samoa in the archipelago of Samoan Islands. It is the third largest island in the Samoan Islands chain of the Central Pacific located roughly 4,000 kilometers (2,500 mi) northeast of Brisbane, Australia and over 1,200 kilometers (750 mi) northeast of Fiji. It contains a large, natural harbor, Pago Pago Harbor, where Pago Pago, the capital of American Samoa is situated.
Pago Pago International Airport is also located on Tutuila island. Its land expanse is about 68% of the total land area of American Samoa and with 56,000 people accounts for 95% of its population. The island has six terrestrial and three marine ecosystems. The island is also known popularly as the "Rock". The mountainous regions (highest point at 653 m) of the island, its beaches, coral reefs, World War II relics, and the sporting activities such as scuba diving, snorkeling and hiking activities make it attractive to tourists.
The National Park of American Samoa in Tutuila was established in 1988 for preserving its perfect terrestrial and marine environment. It covers an area of 2,000 ha (4,900 acres) and is bound on the north coast between Fagasa and Afono villages. The Rainmaker pass is located within this park with its rain forests. The Amalau valley between the Afono and Vatia villages in the park has many species of birds and animals. The most significant faunal species consists of the two species of the flying fox (bats), which the local Samoans consider as the protector guardian of the forest and also its people.