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There are over 500 in Brazil, but the total number is unknown.
Cor! There are thousands of rivers bigger than the Murray. Nile and Amazon for a start.
Most rivers flow through more than one country and the links below will five a full listing.
The Amazon River in South America carries the most water of any river in the world. Its average flow is greater than the next seven largest rivers combined.
The mouth of a river is where it meets the sea or ocean. The Amazon river's mouth is actually un-pinpointable because of the rivers amazing length, meaning the mouth covers more than one area.
Amazon River
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There are numerous rivers whose lengths are longer than that of Australia, however, their area is not larger than Australia. These rivers include the Nile, the Amazon, the Yangtze, the Mississippi/Missouri, the Yenisei, the Yellow River, the Ob River, the Paraná River, and the Congo River.
The Amazon River accounts for about a fifth of the drainage of all the rivers in the world! That means that of all the water (volume) drained by all the rivers of the world, the Amazon alone handles about 20% or 1/5th of it. That's a lotof water! Additionally the Amazon basin, the name given to the area of land that the Amazon drains, is the largest river basin in the world. The Amazon is clearly the largest river in the world. Note that by some geographic fluke, the Nile River is a tiny bit longer than the Amazon. A link can be found below.
The river that crosses northern Brazil is the Amazon River. This river is larger than the next seven largest rivers in the world combined.
Amazon River
The Amazon River passes through several countries in South America, including Peru, Colombia, and Brazil. It is the largest river in the world by volume and contains more water than the next seven largest rivers combined.