The tropical grassland is basically the Brazilian plateau, the largest plateau in the world, covering more than 5 million square kilometers, accounting for more than half of Brazil's territory. The tropical rainforest is basically the Amazon plain, the largest plain in the world, covering more than 6 million square kilometers (including more than 3 million square kilometers in Brazil, accounting for about 1/3 of the country's territory) Note: Brazil's land area is 8.51 million square kilometers.