The Treaty of Peace and Friendship of 1984 between Chile and Argentina (Spanish: Tratado de Paz y Amistad de 1984 entre Chile y Argentina, see the text in the United Nations) was signed into agreement at the Vatican on 29 November 1984.
It was ratified
On 12 April 1985 it was signed by Augusto Pinochet and on 2 May 1985 the Foreign Ministers of both countries exchanged original documents. Due to the timing, the treaty is variously known as the 1984 Treaty or the 1985 Treaty.
The treaty contains a preamble, a maritime border definition, a comprehensive body of legislation on solving disputes, ship navigation rights and an exact definition of the border through the Straits of Magellan. Chile and Argentina, though never at war with each other, have named some of their border treaties as "peace treaties".
The treaty ended the Beagle conflict and was the result of long standing negotiations between Chile, Argentina and the Vatican as mediator. The outcome of the Falklands war made the treaty possible. When consulted in a non-binding referendum on resolving the conflict by then President Raul Alfonsin, 82% of Argentine population voted in favor of signing the treaty.
Excepting articles 1 to 6, which define a comprehensive body of legislation regarding dispute resolution, the other provisions shall not affect in any way, nor may they be interpreted in any way, that can affect, directly or indirectly, the sovereignty, rights, juridical positions of the Parties, or the boundaries in Antarctica or in its adjacent maritime areas, including the seabed and subsoil.
The international maritime border is the line ABCDEF. Westward are Chilean waters, eastward are Argentine waters.
Both countries mutually recognized its baselines. (The Chilean Baseline can be seen here). From the Cape Horn Meridian (67°16',0 West) to the east end of the Isla de los Estados both countries reduced their internal waters to 3 nmi (5.6 km) only in their mutual relations.