Argentina–Chile relations refers to international relations between the Republic of Chile and the Argentine Republic. Argentina and Chile share the world's third-longest international border, which is 5,300 km (3,300 mi) long and runs from north to south along the Andes mountains. Although both countries gained their independence during the South American wars of liberation, during much of the 19th and the 20th century, relations between the countries were chilled as a result of disputes over the border in Patagonia. Despite this, Chile and Argentina have never been engaged in a war with each other. In recent years, relations have improved dramatically in spite of social differences, as well as ideological differences between the current presidents of Chile and Argentina. Despite increased