The Amazon River is the second-longest river in the world, but what is its approximate length?
- 6,400 km (3,980 miles)
- 7,062 km (4,389 miles)
- 5,946 km (3,694 miles)
- 6,992 km (4,345 miles)
"The clearest way into the Universe is through a forest wilderness." – John Muir
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