The Amazon River originates from the Cordillera Mountains in central Peru, with a total length of 6,751 kilometers, 3,165 kilometers of which are in Brazil. The river is wide and has many tributaries. The river basin and flow rate are both ranked first in the world, and the water volume accounts for 20% of the world's total fresh water. The Amazon Plain formed by the impact of the Amazon River covers an area of ​​7.05 million square kilometers, most of which are located in Brazil. The Amazon Basin is suitable for plant growth. There are vast virgin forests, more than 20,000 species of plants, and high-quality timber. It is known as the "lungs of the earth". The upper reaches of the Amazon River are composed of the Black River and the Solimões River. The water of the Solimões River is yellow, and the water of the Black River is espresso brown. Due to different specific gravity and flow rate, the two rivers are black and yellow respectively on the river surface for tens of kilometers at the intersection, and they do not offend each other, which has become a major landscape.