The largest rainforest on Earth is the Amazon Rainforest. Spanning across several countries in South America, including Brazil, Peru, Colombia, and Venezuela, the Amazon covers an area of approximately 5.5 million square kilometers. This vast expanse of forest is often referred to as the "lungs of the planet" due to its ability to produce large amounts of oxygen and absorb carbon dioxide. The Amazon is home to an incredibly diverse range of flora and fauna, including countless species of plants, birds, insects, and mammals. It plays a critical role in regulating the Earth's climate and is vital for biodiversity.