evidence: French Guiana is an overseas department of France, located on the northern coast of South America. Like the other French departments, French Guiana is an overseas region of France, one of 26 regions of France. As a part of France, French Guiana is thus part of the European Union's territory, and its currency is the euro. [...] French Guiana consists of two main regions: A coastal strip where the majority of people live, and dense, near-inaccessible rainforest, which gradually rises to the modest peaks of the Tumac-Humac mountains along the Brazilian frontier. French Guiana's highest peak is Bellevue de l'Inini (851 m). Other mountains include Mont Machalou (782 m), Pic Coudreau (711 m), Mont St Marcel (635 m), Mont Favard (200 m), and Montagne du Mahury (156 m). Several small islands are found off the coast: the three Iles du Salut Salvation Islands that include Devil's Island and the isolated Ile de Connetable bird sanctuary farther along the coast toward Brazil. [...] French Guiana, as part of France, is part of the European Union, the largest part in area outside Europe, with one of the longest EU external boundaries. Along with the Spanish enclaves in Africa of Ceuta and Melilla, it is one of only three EU territories outside Europe that is not an island.