Libertatia was a - possibly fictional - anarchist colony founded in the late 17th century in Madagascar by pirates under the leadership of Captain James Misson. Whether or not Libertatia actually existed is disputed. It is described in the book A General History of the Pyrates by Captain Charles Johnson.
According to Johnson's description, Libertatia lasted for about 25 years. The precise location is not known, however, most sources say it stretched from the Bay of Antongil to Mananjary, including Île Sainte Marie and Foulpointe.