Guantanamo Bay Naval Base (Spanish: Base Naval de la Bahía de Guantánamo), officially known as Naval Station Guantanamo Bay or NSGB, (also called GTMO because of the airfield designation code or Gitmo because of the common pronunciation of this code by the U.S. military) is a United States military base located on 45 square miles (120 km2) of land and water at Guantánamo Bay, Cuba, which the U.S. leased for use as a coaling and naval station in 1903 for $2,000 in gold per year until 1934, when the payment was set to match the value in gold in dollars; in 1974, the yearly lease was set to $4,085. The base is on the shore of Guantánamo Bay at the southeastern end of Cuba. It is the oldest overseas U.S. Naval Base. Since the Cuban Revolution of 1959, the Cuban government has consistently protested against the U.S. presence on Cuban soil and called it illegal under international law, alleging that the base was imposed on Cuba by force. At the United Nations Human Rights Council in 2013, Cuba's Foreign Minister demanded the U.S. return the base and the "usurped territory", which the Cuban government considers to be occupied since the U.S. invasion of Cuba during the Spanish–American War in 1898. Since 2002, the naval base has contained a military prison, the Guantanamo Bay detention camp, for unlawful combatants captured in Afghanistan, Iraq, and other places during the War on Terror. Cases of torture of prisoners, and their alleged denial of protection under the Geneva Conventions, have been condemned internationally.