The Uruguay River forms the border between Uruguay & Argentina & most of the border between Argentina & this country
- WorldAtlas.com [PAR] Jun 6, 2016 ... NASA photo of Uruguay and Paran Rivers merging into the Ro de la ... Plata 
forms a natural border between the South American countries of Uruguay and 
Argentina, and the surrounding lands are some of the most densely... [DOC] [TLE] Detailed Map of Uruguay - Nations Online Project [PAR] Uruguay is a country on the Atlantic coast of South America south of Brazil, it 
borders ...