The Viceroyalty of the Río de la Plata (Spanish: Virreinato del Río de la Plata) was the last to be organized and also the shortest-lived of the Viceroyalties of the Spanish Empire in the Americas. The Viceroyalty was established in 1776 from several former Viceroyalty of Perú dependencies that mainly extended over the Río de la Plata Basin, roughly the present-day territories of Argentina, Bolivia, Paraguay and Uruguay, extending inland from the Atlantic Coast. Buenos Aires, located on the western shore of the Río de la Plata estuary flowing into the Atlantic Ocean, opposite the Portuguese outpost of Colonia del Sacramento, was chosen as the capital. Usually considered one of the late Bourbon Reforms, the organization of this viceroyalty was motivated on both commercial grounds (Buenos Ai