evidence: The British overseas territory of Gibraltar, a limestone outcrop on the southern tip of the Iberian peninsula, occupies a commanding position at the western gateway to the Mediterranean Sea. [...] Gibraltarians are British citizens. They elect their own representatives to the territory's House of Assembly; the British monarch appoints a governor. Gibraltar is self-governing in all areas except defence and foreign policy. It is home to a British military garrison and naval base. [...] Gibraltar's 1969 constitution states that there can be no transfer of sovereignty to Spain against the wishes of locals. In a 2002 referendum Gibraltarians resoundingly rejected the idea of joint sovereignty. Spain and Britain were said to have reached "broad agreement" on the concept.