military action and withdraw its forces from all Lebanese territory. It also established the United Nations Interim Force in Lebanon (UNIFIL). The first UNIFIL troops arrived in the area on 23 March 1978. The Blue Line is based on the deployment of the IDF prior to 14 March 1978. It should not be confused with the Green Line, established in 1949, which is the armistice line of the 1948 Arab–Israeli War, nor the Green Line in Beirut during the violence of the 1980s. The 1949 line is in turn the same as the 1923 Mandate Line which was the border between French- and British-mandated territory (see: Paulet–Newcombe Agreement); Lebanon is a former French mandate and Palestine / Israel a former British mandate. (See League of Nations). The 1949 agreement stated that the border would follow the 1923 line. In 1923, 38 boundary markers were placed along the 49 mile border and a detailed text description was published. The 2000 Blue Line differs in about a half dozen short stretches from the 1949 line, though never by more than 475 meters. Borders are usually negotiated between countries, and between 1950 and 1967 Israeli and Lebanese surveyors managed to complete 25 non-contiguous kilometers and mark (but not sign) another quarter of the international border. On 17 April 2000, when Israeli Prime Minister Ehud Barak announced that Israel would begin withdrawing its forces from Lebanon, the Lebanese government did not want to take part in marking the border. The UN thus conducted its own survey based on the line discussed in United Nations Security Council Resolution 425. On 25 May 2000 the government of Israel notified the Secretary-General that Israel had redeployed its forces in compliance with Security Council resolutions 425. From 24 May to 7 June 2000, the Special Envoy traveled to Israel and Lebanon to follow up on the implementation of the Secretary-General's May 22 report. The United Nations cartographer and his team, assisted by UNIFIL, worked on the ground to identify a line to be adopted for the practical purposes of confirming the Israeli withdrawal. While it was agreed that this would not be a formal border demarcation, the aim was to identify a line on the ground closely conforming to the internationally recognized boundaries of Lebanon, based on the best available cartographic and other documentary evidence. On 7 June the completed map showing the withdrawal line was formally transmitted