Foreign relations of Nigeria bilateral relations Delimitation of international boundaries in the vicinity of Lake Chad, the lack of which led to border incidents in the past, has been completed and awaits ratification by Cameroon, Chad, Niger, and Nigeria; dispute with Cameroon over land and maritime boundaries around the Bakasi Peninsula is currently before the International Court of Justice; maritime boundary dispute with Equatorial Guinea because of disputed jurisdiction over oil-rich areas in the Gulf of Guinea. The Federation of Nigeria became independent from the United Kingdom in 1960 with Queen Elizabeth II as Queen of Nigeria. Nigeria became a Commonwealth republic in 1963,
Rail transport in Chad Imperial expansionist policy known as Mittelafrika. In the 1950s a line through Chad from Port Sudan to Nigeria was proposed but opposed by Chad governmental organisations. In 1958 plans for a line from Cameroon the "Société Civile d'Études du Chemin de Fer Douala-Tchad" (SEDOT) was formed, and continued planning led to start of construction in 1964 - the line was constructed as far as Ngaoundéré in Cameroon (the Trans-Cameroon Railway, completed 1975.). Initial plans were for an extension to Moundou in Chad, but this was not completed. In 1959 a multinational agency, the "Agence Transéquatoriale des Communications" (ATEC) was formed