Location of the most important reductions, with present political divisions.
The Jesuit reduction was found in founded in 1626, and by 1744 it held a population of 993. It was abandoned when the Jesuits were expelled from the Spanish colonies in 1767. The ruins of the reduction were declared World Heritage Site by UNESCO in 1984, together with other reductions in the area. The ruins have been taken over by vegetation, and are not as well preserved as those of San Ignacio Miní, also in Misiones.