East Timor, also known as Timor-Leste (officially the Democratic Republic of Timor-Leste) is a country in Southeast Asia. It comprises the eastern half of the island of Timor, the nearby islands of Atauro and Jaco, and Oecussi-Ambeno, an exclave on the northwestern side of the island, within Indonesian West Timor. The small country of 15,410 km² (5,400 sq mi) is located about 640 km (400 mi) northwest of Darwin, Australia. East Timor was colonized by Portugal in the 16th century, and was known as Portuguese Timor until Portugal’s decolonization of the country. In late 1975, East Timor declared its independence, but later that year was invaded and occupied by Indonesia and was declared Indonesia’s 27th province the following year. In 1999, following the United Nations-sponsored act of self-determination, Indonesia relinquished control of the territory and East Timor became the first new sovereign state of the 21st century on May 20, 2002