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The Argentina–Chile border is the longest international border of South America and the third longest in the world after the Canada–United States border and the Kazakhstan–Russia border. With a length of 5,150 kilometres, it separates Argentina from Chile along the Andes and on the islands of Tierra del Fuego. However, there are some border disputes, particularly around the Southern Patagonian Ice Field.
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The northern end of the border is a tripoint it forms with those at the Argentina-Bolivia border and the Bolivia-Chile border in Atacama desert. It extends south to the Strait of Magellan and ends on Isla Grande de Tierra del Fuego. It separates the island into two to its coast a few kilometres south west of Ushuaia.
In November 1984 in the southern border area is finally established after long negotiations and mediation of John Paul II by the Treaty of Peace and Friendship between Argentina and Chile from 1984, a perpetual treaty, signed at the Vatican by representatives of both countries.
On 16 December 1998, an agreement between Argentina and Chile said the frontier line from Mount Fitz Roy and Cerro Daudet. This border is in the Region of Magallanes and Chilean Antarctica, Province of Ultima Esperanza at the Icefield Southern Patagonia.