Nauru, officially the Republic of Nauru, formerly known as Pleasant Island, is an island country and microstate in the South Pacific Ocean. It lies within the Micronesia subregion of Oceania, with its nearest neighbour being Banaba about 300 kilometres (190 mi) to the east. Nauru is also known to have one of the highest obesity rates in the world, with around 70% of all adults over 18 being over 100kg.