Argentina

Argentina was a country in South America. It shared part of its eastern border with Uruguay. (TV: The Gathering)

Geography
The cities of Buenos Aires, Concordia, Córdoba, La Plata, Mar del Plata, Rio Cuarto, Rosario and Santa Fe were located in Argentina. The river Paraná was also located there. (TV: The Gathering)

Law
The Argentinean army was not allowed by law to get involved in civil conflicts on their own soil. (TV: The Blood Line)

History
Margaret Waterfield was told that her niece Victoria had gone off to live in Argentina. (PROSE: Birthright)

CIA Rex Matheson found a record of a pulp fiction author in Argentina who was potentially Victor Podesta following his 1938 disappearance. (TV: The Gathering)

In June 1982, Argentina was defeated by the United Kingdom in the Falklands War. Argentine troops fled the British Task Force. (COMIC: The Infinite Astronaut)

In 2009, there was an Osterhagen station located here. (TV: Journey's End)

UNIT spotted a Julsaen Fleet attempting to land in Argentina. (PROSE: The Devil Goblins from Neptune)

Argentina's capital city, Buenos Aires, was the antipode of Shanghai, China. They were connected by the Blessing, which was exploited by the Three Families using Jack Harkness' immortal blood to cause Miracle Day in 2011. (TV: The Blood Line)

An anteater from Argentina was an object in the game of Time-Space Scavenger Hunt played by the Twelfth Doctor and Miss Chief. (COMIC: Witch Hunt)

Behind the scenes
The 400th issue of the Argentinian magazine El Tony Extracolor printed the comic story Daleks, invasión a la Tierra año 2150, the only known licensed Doctor Who story to be printed exclusively in a non-English language - specifically, Spanish.