Analyze Brazil’s topographic features. Talk about why the Amazon River has a large basin, large flow, and stable flow.

Because the main line of the Amazon River is located in the world's largest tropical rainforest area, the Amazon Rainforest. Since the tropical rainforest climate is characterized by high temperatures and rainy weather all year round, the flow of the Amazon River is large and stable. The Amazon River has many branch rivers, so its drainage area is very wide.

Because it is estimated that about 20-25% of all the water flowing on the earth's surface is in the Amazon River. The estuary is 240 kilometers wide, and the flow during flooding reaches 180,000 cubic meters per second, 10 times that of the Mississippi River. The amount of water discharge is so large that the sea water within 160 kilometers from the shore becomes fresh. There are more than 1,000 known tributaries, 7 of which are more than 1,600 kilometers long. The fertile silt deposited by the Amazon River nourishes an area of ??65,000 square kilometers. Its drainage area is about 7.05 million square kilometers, almost twice the area of ??any other large river basin in the world. The famous Amazon rainforest grows in the Amazon River Basin. It is also the largest plain in the world (an area of ??5.6 million square kilometers). The plains are low and flat, most of them below 150 meters above sea level. Therefore, the rivers here meander and there are many lakes and swamps. Rainy, humid and persistently high temperatures are its notable climate characteristics. It contains the richest and most diverse biological resources in the world, with millions of species of various species.