Nauru, officially the Republic of Nauru and formerly known as Pleasant Island, is an island country and microstate in Micronesia, part of Oceania in the Central Pacific. Its nearest neighbour is Banaba of Kiribati, about 300 km (190 mi) to the east.

A microstate or ministate is a sovereign state having a very small population or land area, usually both. However, the meanings of "state" and "very small" are not well-defined in international law. Some recent attempts to define microstates have focused on identifying qualitative features that are linked to their size and population, such as partial delegation of their sovereignty to larger states, such as for international defense.