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There is sea on the east side of Argentina. Uruguay borders to the north east.
Uruguay shares its western border with Argentina.
From west to east, Bolvia is southern border is with Chile, Argentina, and Paraguay.
Argentina
Bolivia and Paraguay border Argentina to the north.
Three countries can be said to border Brazil and Argentina, they are Bolivia, Paraguay and Uruguay.
Uruguay
The country that borders Brazil, Bolivia, and Argentina is Paraguay.
Both Brazil and Chile border Argentina, Bolivia and Peru.
Chile is west of Argentina.
Bolivia.
It IS Uruguay