Pakistan became a member of the UN on 30 September 1947 and is a member of its specialized agencies, including ESCAP.
As an Islamic state, Pakistan is an active member of the Organization of the Islamic Conference (OIC) and participates in various Muslim Afro-Asian organizations. Pakistan also belongs to the Asian Development Bank, the Colombo Plan, G-77, and the WTO and has signed the Law of the Sea. Following the establishment of Bangladesh, Pakistan withdrew from the Commonwealth of Nations in 1972; it rejoined in 1989.
In 1960, Pakistan and India signed an Indus water basin treaty opening the way to the peaceful use and development of water resources. Pakistan, Turkey, and Iran established a tripartite arrangement, called Regional Cooperation for Development (RCD), in 1964. In 1985, Pakistan and six other South Asian countries, including India and Bangladesh, formed the South Asian Association for Regional Cooperation (SAARC).