The world's longest river in South America is the Amazon River. Stretching approximately 4,345 miles (7,062 kilometers), it traverses through several countries, including Brazil, Peru, and Colombia. The Amazon basin, rich in biodiversity, is considered one of the most vital ecosystems on the planet. It is noted not only for its length but also for the vast volume of water it discharges, making it the largest river by discharge volume. The Amazon River has played a significant role in the cultural, economic, and environmental aspects of the region and continues to be a subject of international interest and study.