Argentina–Uruguay border

It starts in a triple border Argentina-Uruguay-Brazil, at the mouth of the Quaraí River in the Uruguay.

The course follows the Uruguay river, passing west of the Uruguayan departments of Artigas, Salto, Paysandu, Rio Negro, Soriano and Colonia and the Argentine provinces of Corrientes, Entre Rios and Buenos Aires,[1] until the confluence of the Uruguay and the Paraná rivers into the Rio de la Plata.

The Uruguay River was always a physical limit that separated the former Eastern Band of the rest of the Viceroyalty of Rio de La Plata and Banda Oriental.

Depending on the presence of this river, the border between Banda Oriental and Viceroyalty of Rio de La Plata was not disputed.

After the war, the Treaty of Montevideo, sovereign Republic of Uruguay was created.