The world's largest rainforest is the Amazon Rainforest, which spans across multiple countries in South America, including Brazil, Peru, Colombia, and others. It is renowned for its vast biodiversity, housing millions of species of plants, animals, and microorganisms. The Amazon plays a crucial role in global climate regulation, producing significant amounts of oxygen and acting as a carbon sink. Covering an area of approximately 5.5 million square kilometers, it is often referred to as the "lungs of the Earth" due to its extensive tree cover and vegetation that contributes to oxygen production.