The Mano River Union (MRU) is an international association initially established between Liberia and Sierra Leone by the 3 October 1971 Mano River Declaration. It is named for the Mano River which begins in the Guinea highlands and forms a border between Liberia and Sierra Leone. On 25 October 1980, Guinea joined the union.
The goal of the Union was to "accelerate the economic growth, social progress and cultural advancement of our two countries ... by active collaboration and mutual assistance in matters of common interest in economic, social, technical, scientific and administrative fields". However, due to internal conflicts within the two original MRU countries (the Sierra Leone Civil War [1991-2002] and the First [1989-1997] and Second Liberian Civil Wars [1999-2003]), these objectives could not be achieved. The staff numbered 600 in 1986, but was down to 300 in 1993, then to 120, and 48 in 2000.
On 20 May 2004, the Union was reactivated at a summit of the three leaders of the Mano River Union states: Presidents Lansana Conté of Guinea, Ahmad Tejan Kabbah of Sierra Leone and Chairman Gyude Bryant of Liberia. On 15 May 2008, Cote d'Ivoire agreed to join the union.
The MRU is run by a secretariat, headed by a Secretary-General. When Secretary-General Habib Diallo was killed in a car crash in 2011, his successor was the first woman to hold that office: Dr Saran Daraba Kaba. The Mano River Union Secretariat is based in Freetown, Sierra Leone, with offices in Conakry, Guinea and Monrovia, Liberia.