Mayotte (French: Mayotte, pronounced: [majɔt]; Shimaore: Maore, IPA: [maˈore]; Malagasy: Mahori) is an overseas department and region of France consisting of a main island, Grande-Terre (or Mahoré), a smaller island, Petite-Terre (or Pamanzi), and several islets around these two. The archipelago is located in the northern Mozambique Channel in the Indian Ocean, namely between northwestern Madagascar and northeastern Mozambique. Mayotte's area is 374 square kilometres (144 sq mi), and with its estimated 194,000 people is very densely populated (520 /km2 or 1,300 /sq mi). Its biggest city and prefecture is Mamoudzou. The territory is geographically part of the Comoro Islands, but has been politically separate since a 1974 referendum in which it elected to remain under French rule. The territory is also known as Mahoré, the native name of its main island, especially by advocates of its inclusion in the Union of Comoros. In a 2009 referendum, the population overwhelmingly approved accession to status of department (95.2% voted in favour of departmental status). Mayotte became an overseas department on 31 March 2011, and will become an Outermost region of the European Union on 1 January 2014.