Guantánamo Bay is a bay in Guantánamo Province at the southeastern end of Cuba. It is the largest harbor on the south side of the island and it is surrounded by steep hills which create an enclave that is cut off from its immediate hinterland.
The United States assumed territorial control over the southern portion of Guantánamo Bay under the 1903 Lease. The United States exercises jurisdiction and control over this territory, while recognizing that Cuba retains ultimate sovereignty. The government of Cuba regards the U.S. presence in Guantánamo Bay as an illegal occupation on the basis that the Cuban–American Treaty "was obtained by threat of force and is in violation of international law." Some legal scholars judge that the lease may be voidable. It is the home of the Guantanamo Bay Naval Base and the Guantanamo Bay detention camp located within the base, which are both governed by the United States. Since the 1959 revolution, Cuba has only cashed a single lease payment from the United States government.