Tutuila with its 140 km² 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 northeast of Brisbane, Australia and over 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.