The ''Treaty of Valparaiso'' was an agreement between

Chile Chile, officially the Republic of Chile, is a country in the western part of South America. It is the southernmost country in the world, and the closest to Antarctica, occupying a long and narrow strip of land between the Andes to the east a ...

and

Bolivia , image_flag = Bandera de Bolivia (Estado).svg , flag_alt = Horizontal tricolor (red, yellow, and green from top to bottom) with the coat of arms of Bolivia in the center , flag_alt2 = 7 × 7 square p ...

that ended the War of the Pacific. Signed on April 4, 1884, the third treaty of the war forced Bolivia to give Antofagasta to Chile.

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