High Quality Content by WIKIPEDIA articles! Tutuila 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 accounts for 95% of its population. The island has six terrestrial and three marine ecosystems. The island is also known popularly as the "Rock".