The following outline is provided as an overview of and topical guide to Nauru: Nauru – sovereign island nation located in the Micronesian South Pacific. Its nearest neighbour is Banaba Island in the Republic of Kiribati, 300 kilometres (190 mi) due east. Nauru is the world's smallest island nation, covering just 21 square kilometres (8 sq mi), the smallest independent republic, and the only republican state in the world without an official capital. It is the least populous member of the United Nations.