Except for the mountainous western area, Argentina is for the most part a lowland country. It is divided into four topographical regions: the Andean region, Patagonia, the subtropical plain of the north, and the pampas. The Andean region, almost 30% of the country, runs from the high plateau of the Bolivian border southward into western Argentina.
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Argentina lays claim to a section of Antarctica of about 1,235,000 sq km (477,000 sq mi). Both Argentina and the UK claim the Falkland Islands (Islas Malvinas), with the UK exercising effective occupancy. In 1978, Argentina almost went to war over three Chilean-held islands in the Beagle Channel. The case was referred to papal mediation; on 29 November 1984, the two countries signed a treaty that confirmed Chile’s sovereignty over the three islands.