Madeira River

The Madeira River is a major waterway in South America, estimated to be 1,450 km in length, and is the largest tributary of the Amazon, accounting for 15% of the water in the basin. The river has a high mean inter-annual discharge of 18,000 cubic meters per second, making it one of the largest rivers by discharge in the world. The river's catchment area is approximately 850,000 km2, and it receives drainage from the north-eastern slopes of the Andes, the south-western slope of Brazilian Mato Grosso, and the northern slope of the Chiquitos sierras.learn more on wikipedia