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TheGovernorate of theRío de la Plata (1549−1776) (Spanish:Gobernación del Río de la Plata,pronounced[ɡoβeɾnaˈsjondelˈri.oðelaˈplata]) was one of thegovernorates of the Spanish Empire. It was created in 1549 by Spain in the area around theRío de la Plata.
It was at first simply a renaming of theNew Andalusia Governorate and included all of the land between 470 and 670leagues south of the mouth of theRío Santiago along the Pacific coast. After 1617,Paraguay was separated under a separate administration (Asunción had been the capital of the governorate sinceJuan de Ayolas.)
After the founding of theViceroyalty of Peru in 1542, the governorate was since its birth under its authority until the formation of the independentViceroyalty of the Rio de la Plata in 1776. Similarly, it was under the jurisdiction of theRoyal Audience of Charcas until the formation of the independentRoyal Audience of Buenos Aires from 1661 to 1671 and after 1783.
Guayrá was separated into a separateGovernorate of Paraguay in 1617.
