Jacques Tuset, Ned Denison, Jills Vanegas Escape Île St-Joseph Courtesy of Ned Denison and Gary Emich, Devil's Island. Devil's Island (French: île du Diable) is the third largest island of the Îles du Salut island group in the Atlantic Ocean, located 14 km (9 miles) off the coast of French Guiana in South America. The island was a part of the