Argentina is the second largest country in South America after Brazil and the eighth largest country in the world. With the Andes forming its western border with Chile, the country's varied geography can be grouped into four geographic regions or sectors and seven natural regions or ecosystems.
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Alberto de Agostini National Park is a protected area in southern Chile that includes the Cordillera Darwin mountain range, the final land-based stretch of the Andes before it becomes a chain of mountains appearing as small islands that sink into the Pacific Ocean.
Alerce Andino National Park is located in the Andes, in the Los Lagos Region of Chile. The centerpiece of this lush and mountainous protected area is the Alerce forests. The Alerce can surpass 50 m (164 ft) in height and live over 4,000 years.
Alerce Costero National Park is a protected area located in the Los Ríos Region of southern Chile. Situated within the Cordillera Pelada, part of the larger Chilean Coastal Range, the national park hosts a forest of endangered Patagonian cypress.
Alter do Chão is the main tourist area of Santarém in Pará state, Brazil. A popular tourist spot, with some of the most beautiful freshwater beaches in Brazil, Santarém is the most important town on the Amazon between Belém and Manaus and is a port of call for river steamers.
The Altiplano Cundiboyacense is a high plateau located in the Eastern Cordillera of the Colombian Andes. The most important city is the capital Bogotá. The altiplano corresponds to the territory of the Muisca who flourished in ancient Colombia between 600 and 1600 CE.
The Altiplano is a high plateau region in west-central South America in the area where the Andes are the widest. The bulk of the Altiplano-Puna plateau lies in Bolivia but its northern parts lie in Peru and its southern parts lie in Chile and Argentina. The Altiplano Basin is a sedimentary basin located on the plateau.
The Altiplano-Puna volcanic complex is a major caldera and silicic ignimbrite volcanic field located in the southern portion of the Altiplano-Puna plateau, an elevated dry region in the central Andes that includes parts of Argentina, Bolivia and Chile. It includes two active geothermal fields: El Tatio and Sol de Manana.
The Alto Mayo Protection Forest is an area of protected forestland in northern Peru. This area preserves a portion of the tropical yungas forest in the upper Mayo River basin while protecting soil and water from erosion by deforestation. The area is the water supply for populations in the Mayo valley.
The Alto Orinoco-Casiquiare Biosphere Reserve is located in the Venezuelan Amazon. Duida-Marahuaca National Park, a national protected area which includes the Duida–Marahuaca Massif, lies within the Biosphere Reserve.
Amacayacu National Natural Park is a national protected area of Colombia, situated along the Amazon River in the south of the country, in the Amazonas Department. It is the country's only protected area that conserves the flooded forests of the Amazon River.