and its 4km under the ground 0_o

http://www.guardian.co.u...nderground-river-amazon

"The Amazon flows much faster than the Hamza, however, draining a greater volume of water. Around 133,000m3 of water flow through the Amazon per second at speeds of up to 5 metres per second. The underground river's flow rate has been estimated at around 3,900m3 per second and it barely inches along at less than a millimetre per hour."

wow.

Holy...shit. What an amazing discovery! I never even considered underground rivers, I wonder what else is under our feet. How do you figure 100x the largest river on Earth? That's insane..

Just goes to show there's a lot more to be known about the world than what meets the eye.