South America: Home to the Amazon (2nd Longest River) and Atacama (Driest Desert)

South America uniquely hosts both the world's second-longest river (Amazon, ~6,400 km) and the world's driest non-polar desert (Atacama).

Atacama Desert (Chile/Peru)

• Hyper-arid core: <1 mm/year rain; some stations never recorded rain.
• Rain shadow of Andes + cold Humboldt Current + subtropical high = extreme aridity.
• Mars analog: NASA tests rovers here. Nitrate deposits (historical wealth).
• Ojos del Salado (6,893 m) — world's highest active volcano, on Atacama edge.

Amazon River

• Largest discharge (209,000 m³/s), largest basin (7M km²), ~6,400 km long.
• Source: Nevado Mismi (Peruvian Andes). Mouth: Atlantic (Brazil).
• Drains 40% of South America. Unmatched biodiversity.

Continental Contrast

The Andes create this duality: they block moisture from the Amazon (easterlies) reaching the Atacama (west), while forcing Amazon moisture to rise and precipitate on eastern slopes. One mountain range engineers both extremes.