Polisario Front in the context of "Moroccan Western Sahara Wall"

Western Sahara is a non-self-governing territory in North-western Africa undergoing decolonization. It has a surface area of 272,000 square kilometres (105,000 sq mi). Western Sahara is the last African colonial state yet to achieve independence and has been dubbed "Africa's last colony". With an estimated population of around 600,000 inhabitants, it is the most sparsely populated territory in Africa and the second most sparsely populated territory in the world, consisting mainly of desert flatlands.

Spain previously colonized the territory as the Spanish Sahara until 1976, when it attempted to transfer its administration to Morocco and Mauritania while ignoring an International Court of Justice's verdict that those countries had no sovereignty over Western Sahara. A war erupted and the Polisario Front—a national liberation movement recognized by the United Nations as the legitimate representative of the people of Western Sahara—proclaimed the Sahrawi Arab Democratic Republic (SADR) with a government-in-exile in Tindouf, Algeria. Mauritania withdrew its claims in 1979, and Morocco secured de facto control of most of the territory, including all major cities and most natural resources. A UN-sponsored ceasefire agreement was reached in 1991, though a planned referendum monitored by the UN's MINURSO mission has since stalled.

The Sahrawi Arab Democratic Republic (SADR), also known as the Sahrawi Republic and Western Sahara, is a partially recognized state in the western Maghreb, which claims the non-self-governing territory of Western Sahara, but controls only the easternmost one-fifth of that territory. It is recognized by 44 UN member states and South Ossetia. Between 1884 and 1975, Western Sahara was known as Spanish Sahara, a Spanish colony (later an overseas province). The SADR is one of the two African states in which Spanish is a significant language, the other being Equatorial Guinea.

The SADR was proclaimed by the Polisario Front on 27 February 1976, in Bir Lehlou, Western Sahara. The SADR government calls the territories under its control the Liberated Territories or the Free Zone. Morocco occupies the rest of the disputed territory, and calls these lands its Southern Provinces. The claimed capital city of the SADR is Laayoune (the largest city of the Western Sahara territory). Since the SADR does not control Laayoune, it has established a temporary capital in Tifariti, although most of the day-to-day administration happens in Rabuni, one of the Sahrawi refugee camps located in Tindouf, Algeria.

The Madrid Accords, formally the Declaration of Principles on Western Sahara, was a treaty between Spain, Morocco, and Mauritania setting out six principles which would end the Spanish presence in the territory of Spanish Sahara and arrange a temporary administration in the area pending a referendum.

The territory had been a Spanish province and former colony. The agreement was signed in Madrid on November 14, 1975, six days before Francisco Franco died, although it was never published on the Boletin Oficial del Estado. This agreement conflicted with the Law on decolonization of Sahara, ratified by the Spanish Parliament (Cortes) on November 18.Under the Madrid agreement, the territory would then be divided between Morocco and Mauritania, with no role for either the Polisario Front or the Sahrawi people generally. Following the accords, the Polisario relocated from the Mauritanian border to Algeria.

The Western Sahara War was an armed conflict between the Sahrawi Indigenous Polisario Front and Morocco from 1975 to 1991 (and Mauritania from 1975 to 1979), being the most significant phase of the Western Sahara conflict. The conflict erupted after the withdrawal of Spain from the Spanish Sahara in accordance with the Madrid Accords (signed under the pressure of the Green March), by which it transferred administrative control of the territory to Morocco and Mauritania, but not sovereignty. In late 1975, the Moroccan government organized the Green March of some 350,000 Moroccan citizens, escorted by around 20,000 troops, who entered Western Sahara, trying to establish a Moroccan presence. While at first met with just minor resistance by the Polisario Front, Morocco later engaged a long period of guerrilla warfare with the Sahrawi nationalists. During the late 1970s, the Polisario Front, desiring to establish an independent state in the territory, attempted to fight both Mauritania and Morocco. In 1979, Mauritania withdrew from the conflict after signing a peace treaty with the Polisario Front. The war continued in low intensity throughout the 1980s, though Morocco made several attempts to take the upper hand in 1989–1991. A cease-fire agreement was finally reached between the Polisario Front and Morocco in September 1991. Some sources put the final death toll between 10,000 and 20,000 people.

The Western Sahara conflict has since shifted from military to civilian resistance. A peace process, attempting to resolve the conflict has not yet produced any permanent solution to Sahrawi refugees and territorial agreement between Morocco and the Sahrawi Republic. Today most of the territory of Western Sahara is under Moroccan occupation, while the inland parts are governed by the Sahrawi Arab Democratic Republic, managed by the Polisario Front.

Tindouf (Arabic: تندوف, romanized: Tindūf) is the main town, and a commune in Tindouf Province, Algeria, close to the Mauritanian, Western Saharan and Moroccan borders.

The region is considered of strategic significance as it houses Algerian military bases and an airport with regular flights to Algiers, as well as flights to other domestic destinations. The settlement of Garet Djebilet lies within the municipal territory of Tindouf near the border with Mauritania; the settlement has an iron mine and a defunct airport, and is approximately 70 kilometres (43 mi) northwest of Âouinet Bel Egrâ. Since 1975, it also contains several Sahrawi refugee camps operated by the Polisario Front, a national liberation movement seeking the self-determination of Western Sahara.

The United Nations Mission for the Referendum in Western Sahara (Arabic: بعثة الأمم المتحدة لتنظيم استفتاء في الصحراء الغربية; French: Mission des Nations Unies pour l'Organisation d'un Référendum au Sahara Occidental; Spanish: Misión de las Naciones Unidas para la Organización de un Referéndum en el Sáhara Occidental; MINURSO) is the United Nations peacekeeping mission in Western Sahara, established in 1991 under United Nations Security Council Resolution 690 as part of the Settlement Plan, which had paved way for a cease-fire in the conflict between Morocco and the Polisario Front (representing the Sahrawi Arab Democratic Republic) over the contested territory of Western Sahara (formerly Spanish Sahara).

MINURSO's mission was to monitor the cease-fire and to organize and conduct a referendum in accordance with the Settlement Plan, which would enable the Sahrawi people of Western Sahara to choose between integration with Morocco and independence. This was intended to constitute a Sahrawi exercise of self-determination, and thus complete Western Sahara's still-unfinished process of decolonization (Western Sahara is the last major territory remaining on the UN's list of non-decolonized territories.)

The Free Zone or Liberated Territories (Arabic: المنطقة الحرة, romanized: al-minṭaqa al-ḥurra) is a term used by the Polisario Front government of the Sahrawi Arab Democratic Republic, a partially recognized sovereign state in the western Maghreb, to describe the part of Western Sahara that lies to the east of a 2,200-kilometre (1,400 mi) border wall flanked by a minefield, often referred as the Berm, and to the west and north of the borders with Algeria and Mauritania, respectively. It is controlled by the Sahrawi Arab Democratic Republic, as opposed to the area to the west of the Berm, which is occupied by Morocco as part of its Southern Provinces. Both states claim the entirety of Western Sahara as their territory.

The zone was consolidated as a Polisario-held zone in a 1991 cease-fire between the Polisario Front and Morocco, which had been agreed upon together as part of the Settlement Plan. Morocco occupies the areas west of the Berm, including most of the territory's population. The cease-fire is overseen by the United Nations' MINURSO forces, charged with peacekeeping in the area and the organization of a referendum on independence.

The Sahrawi Arab Democratic Republic (SADR) was proclaimed by the Polisario Front on 27 February 1976, in Bir Lehlu, Western Sahara. SADR claims sovereignty over the entire territory of Western Sahara, a former Spanish colony; however, at present the SADR government controls approximately 20–25% of the territory it claims. It calls the territories under its control the "Liberated Territories", whilst Morocco claims its territories as the "Southern Provinces".

The Sahrawi Arab Democratic Republic has been recognized by 84 United Nations (UN) member states, but, as of November 2024, only 46 member states recognize it due to numerous member states changing their recognition to "frozen" or "withdrawn". SADR has, at some point in time, been recognized by 38 out of the other 54 (70%) African Union (AU) member states, 18 out of 57 (32%) Organisation of Islamic Cooperation (OIC) member states, and 5 out of 22 (23%) Arab League (AL) member states. Several states that do not recognize the Sahrawi Republic nonetheless recognize the Polisario Front as the legitimate representative of the population of the Western Sahara, but not as the government-in-exile of a sovereign state.

Bir Lehlou (also transliterated Bir Lahlou, Bir Lehlu Arabic: بئر الحلو) is an oasis town in north-eastern Western Sahara, 236 km from Smara, near the Mauritanian border and east of the border wall, in Polisario Front-held territory. It has a pharmacy, a school and a mosque. It is the head of the 5th military region of the Sahrawi Arab Democratic Republic and was the factual temporary capital of SADR until Tifariti became the temporary capital in 2008. It is also the name of a Daïra of the Wilaya of Smara, in the Sahrawi refugee camps.

The name "Bir Lehlou" is transcribed from Maghrebi Arabic, and means "the sweet (meaning palatable or non-salty) water well". The Modern Standard Arabic transcription would be "bir al Halū" (بئر الحلو).