The Amazon River Basin starts from Branco, Brazil in the north and Cuenca, Ecuador in the west. The basin spans 25° latitude and 31°30' longitude, with a drainage area of ​​6.915 million square kilometers. The Amazon River is the largest river in South America and the river with the largest drainage area and flow in the world. It is 6,400 kilometers long and eventually flows into the Atlantic Ocean. The upper reaches of the Amazon River are about 2,500 kilometers long and are divided into upper and lower sections. The lower reaches are as long as 1,600 kilometers. The Amazon River system spans the north and south of the equator, with high temperatures and high rainfall all year round. It is rich in species, with more than 2,000 species of freshwater fish. There are also aquatic animals such as manatees, freshwater dolphins, crocodiles, and giant water snakes.