km) long, more than two cannon shots' distance between the British and Spanish guns, was called "the neutral ground" and shown as such on older maps. In 1908, the British built a fence in a portion claimed to be the British half of the neutral territory. Spain does not recognise British sovereignty over the isthmus (including the border), asserting it is Spanish soil. Although both the United Kingdom and Spain used to be part of the European Union (before the United Kingdom's exit), the border was a de facto international frontier with customs and immigration checks; Spain does not formally recognise it as a "frontier", referring to it as a "fence". Rhineland – The Treaty of Versailles designated the Rhineland as a demilitarised zone after World War I, prohibiting the Weimar Republic from deploying its military there. It was re-occupied and re-militarised in 1936 by Nazi Germany in violation of international treaties. Saudi–Iraqi neutral zone – The Uqair Protocol of 1922 established a demilitarised zone between the Sultanate of Nejd and the Kingdom of Iraq, which at the time was a League of Nations mandate administered by the British Empire. Nejd was later incorporated into the Kingdom of Saudi Arabia. The zone was partitioned in 1981 but the treaty was not filed with the United Nations. The zone was finally officially abolished during the Persian Gulf War, when Iraq and Saudi Arabia cancelled all international agreements with each other. Saudi–Kuwaiti neutral zone – The Uqair Protocol established a neutral zone between the Sultanate of Nejd and the British protectorate of Kuwait in 1922. It was partitioned by mutual agreement in 1970. Israel and Egypt: Following the 1948 Arab–Israeli War, a demilitarised zone (the El Auja Zone) was created by the 1949 Armistice Agreements between Israel and Egypt. Israel and Jordan: The Israeli enclave and Jordanian area on Mt. Scopus was designated as a DMZ. The area around the Latrun salient. Israel and Syria: Following the 1948 Arab-Israeli War, three demilitarised zone were created by the 1949 Armistice Agreements between Israel and Syria. Norway and Sweden established a demilitarised zone of 1 km on each side of their border after the dissolution of the union between Norway and Sweden in 1905. The zone was abolished by mutual agreement in 1993. Northern Syria Buffer Zone – A 115 km demilitarised zone in northern Syria straddling portions of the Syria–Turkey border. It was