Mayotte is an overseas department/region and single territorial collectivity of France officially named the Department of Mayotte (French: Département de Mayotte). It consists of a main island, Grande-Terre (or Maore), a smaller island, Petite-Terre (or Pamanzi), and several islets around these two. Mayotte is part of the Comoros archipelago, located in the northern Mozambique Channel in the Indian Ocean off the coast of Southeast Africa, between northwestern Madagascar and northeastern Mozambique. Mayotte is more prosperous than other countries of the Mozambique Channel, making it a major destination for illegal immigration. Mayotte's land area is 374 square kilometres (144 sq mi) and, with its 288,926 people according to January 2021 official estimates, is very densely populated at 773 inhabitants per km (2,001 per sq mi). The biggest city and prefecture is Mamoudzou on Grande-Terre. The Dzaoudzi–Pamandzi International Airport is located on the neighbouring island of Petite-Terre. The territory is also known as Maore, the native name of its main island, especially by advocates of its inclusion in the Union of the Comoros. Administratively, Mayotte is one of the overseas departments of France, and like the other four overseas departments, it is also one of the 18 regions of France, and a fully integrated part of the republic with the same status as Metropolitan France. Mayotte is an outermost region of the European Union and, as an overseas department of France, part of the eurozone. Despite Mayotte's status as a department of France, the majority of the inhabitants do not speak French as a first language, although a majority of the people 14 years and older report in the census that they can speak French (with varying levels of fluency). The language of the majority is Shimaore, a Sabaki language closely related to the varieties in the neighbouring Comoros Islands.