South America

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 is a towering tree species native to the Andes Mountains that can live for over 4,000 years.

Alerce Costero National Park is a protected area in the Los Ríos Region of southern Chile. Situated within the Cordillera Pelada, a mountain range part of the more extensive 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 is a high plateau region in west-central South America where the Andes are the widest. The bulk of the Altiplano-Puna plateau lies in Bolivia, 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 volcanic field located in the southern Altiplano-Puna plateau in the central Andes, including parts of Argentina, Bolivia, and Chile. It includes two active geothermal areas: 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.