The Amazon Cooperation Treaty Organization (ACTO) (Portuguese: Organização do Tratado de Cooperação Amazônica (OTCA)) is an international organization aimed at the promotion of sustainable development of the Amazon Basin.
Its member states are: Bolivia, Brazil, Colombia, Ecuador, Guyana, Peru, Suriname and Venezuela.
The Amazon Cooperation Treaty (ACT) was signed on 3 July 1978 and amended in 1998.
In January 2023, Brazil announced it was hosting the 2023 Amazon Cooperation Treaty Organization Summit in August in the same year.
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