Nov 10, 2024 · Areas of major landmasses are: island of Cuba 40,285 sq mi (104,339 sq km); Isla de la Juventud 934 sq mi (2,419 sq km); numerous adjacent cays (administratively a part of provinces or the Isla de la Juventud) 1,207 sq mi (3,126 sq km). Show More. On New Year’s Day, 1959, revolutionary forces led by Fidel Castro overthrew the government of ...