Where is the population of Brazil mainly concentrated, and what plain area in the northwest is sparsely populated?

The population of Brazil is mainly concentrated in the Brazilian Plateau in the south of Brazil and the coastal areas in the southeast.

Because of the hot tropical climate, the inland plains are not suitable for living, while the climate in the Brazilian Plateau, about 500 meters above sea level, is relatively cool and pleasant. The three most populous states in Brazil are S? o Paulo with a population of 70 million, minas gerais with a population of190,000, and Rio de Janeiro with a population of150,000. The area with the highest population density is the junction of Sao Paulo and Rio, accounting for about 23% of China's population.

The Amazon plain in the northwest is sparsely populated.

Amazon Plain is a primitive hot and humid tropical rain forest area. There is almost no open space in the virgin rainforest. If a large number of people want to live in it, they must cut down trees and reclaim farmland. The land in the rainforest is actually very barren and unfit for living.

Extended data

The geographical environment of Brazil:

Brazil's terrain is mainly divided into two parts, one is the Brazilian plateau above 500 meters above sea level, distributed in southern Brazil, and the other is the plain below 200 meters above sea level, mainly distributed in the Amazon River basin in the north and west. The whole territory is divided into Amazon Plain, Paraguay Basin, Brazil Plateau and Guyana Plateau, of which Amazon Plain accounts for about 1/3 of the national area.

Brazil has three major water systems: Amazon, Parana and San Francisco. The total length of the Amazon River is 67,565,438+0 km, which traverses the northwest of Brazil and covers an area of 3.9 million square kilometers in the Brazilian basin. Parana river, including the parana river and Paraguay rivers, flows through the southwest with many rapids and waterfalls, and is rich in water resources; The San Francisco water system, with a total length of 2,900 kilometers, flows through the arid northeast and is the main irrigation water source in this area.

The coastline is more than 7,400 kilometers long, and the width of the territorial sea is 12 nautical miles, leading to the overseas exclusive economic zone 188 nautical miles. There are many rivers, long in length and large in water, which are mainly distributed in the northern plain.

Most of Brazil has a tropical climate, and some parts of the south have a subtropical climate. The average annual temperature in the Amazon plain is 25 ~ 28 degrees, and the average annual temperature in the southern region is 16 ~ 19 degrees.