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The Niles a major north-flowing river in northeastern Africa, and is the longest river in Africa and the disputed longest river in the world , s a major north-flowing river in northeastern Africa, and is the longest river in Africa and the disputed longest river in the world.

The scientists claim to have traced the river's source to a snow-capped mountain in southern Peru, adding a new twist in the swirling debate over the longest river label.

The Amazon is considered the world's largest river by volume, but scientists have believed it is slightly shorter than Africa's Nile.

The Brazilian scientists' 14-day expedition extended the Amazon's length by about 176 miles (284 kilometers), making it 65 miles (105 kilometers) longer than the Nile.