Brazil, officially the Federative Republic of Brazil, is the largest country in South America and the Latin American region, being the fifth largest in the world in territorial area and population. It is the only country in America where the majority of the Portuguese language is spoken and the largest Lusophone country on the planet, as well as being one of the most multicultural and ethnically diverse nations, due to the strong immigration from various places in the world. Bordered by the Atlantic Ocean to the east, Brazil has a coastline of 7,491 km. The country borders on all other South American countries except Chile and Ecuador, being bordered to the north by Venezuela, Guyana, Suriname and the French overseas department Of French Guiana; To the northwest by Colombia; To the west by Bolivia and Peru; To the southwest by Argentina and Paraguay and to the south by Uruguay. Several archipelagos form part of the Brazilian territory, such as Atol das Rocas, the Archipelago of São Pedro and São Paulo, Fernando de Noronha (the only one inhabited) and Trindade and Martim Vaz. Its current Constitution, formulated in 1988, defines Brazil as a presidential federative republic, formed by the union of the Federal District, the 26 states and the 5 570 municipalities.