2. Amazônia- Rio Amazonas
The AmazonRiver, the largest drainage basin in the world, covers an area of some
6,915,000 square kilometres (2,670,000 sq mi), or some 40 percent of South
America.
The average depth of the river in the height of the rainy season is 40 m (131 ft)
and the average width can be nearly 40 km (25 mi)
The area covered by the water of the River and its tributaries more than triples
over the course of a year. In an average dry season 110,000 square
kilometres (42,000 sq mi) of land are water-covered, while in the wet season the
flooded area of the Amazon Basin
rises to 350,000 square kilometres (135,000 sq mi) At its widest point the
Amazon River can be 11 kilometres (7 mi) wide during the dry season, but during
the rainy season when the Amazon floods the surrounding plains it can be up to
45 kilometres (28 mi) wide.
More than one third of all species in the world live in the Amazon Rainforest, a
giant tropical forest and river with an area that stretches more than 5,400,000
km² (2.1 million square miles) and is among the richest tropical forests in the
world. Amazon river has over 3,000 recognized species of fish and that number is
still growing