The Tanimbar Islands, also called Timur Laut, are a group of about 65 islands in the Maluku province of Indonesia, including Fordata, Larat, Maru, Molu, Nuswotar, Selaru, Selu, Seira, Wotap, Wuliaru and Yamdena. The Indonesian phrase timur laut means 'northeast'.
Geographically, the northeast islands are still part of the Lesser Sunda Islands. The Aru Islands and Kai Islands lie to the northeast, and Babar Island and Timor lie to the west. The islands separate the Banda Sea and the Arafura Sea. The total land area of the Islands is 5440 km² (2100 sq mi).
The largest of the group is Yamdena. Yamdena Island has a range of thickly forested hills along its eastern coast, while its western coast is lower. Saumlaki is the chief town, located on the south end of Yamdena. Other islands include Larat, Selaru, and Wuliaru.
The population was 105,394 at the 2010 Census, of whom about 73% are Christian, and the remainder Muslim or unknown. The tiny island of Tanimbarkei is not part of Tanimbar, but of the Kai Islands and inhabited by less than 1000 very traditional people.
The Tanimbar Islands are part of the Banda Sea Islands moist deciduous forests ecoregion.
In modern history, the Tanimbar islands (as the Aru Islands) were mentioned in the 16th century maps of Lázaro Luís (1563), Bartolomeu Velho (c. 1560), Sebastião Lopes (1565), in the 1594 map of the East Indies entitled Insulce Molucoe by the Dutch cartographer Petrus Plancius, and in the map of Nova Guinea of 1600 (based on Portuguese sources). The Tanimbar Islands were sighted and possibly visited by Portuguese navigators such as Martim Afonso de Melo Jusarte around 1522–1525, who traveled around the archipelagos of Aru (with the reference "Here wintered Martin Afonso de Melo") and Tanimbar, and possibly Gomes de Sequeira in 1526.