Brazilian scientists say they have found signs of a huge underground river flowing far beneath the Amazon River ... and is catalogued the longest in the world with 6.800 kilometers.

T he Amazon river is the largest drainage system in the world in terms of water volume and its drainage basin. The 6,400 kilometer (4,000 mile) river flows from the Andes Mountains of Peru ...

The moon causes a tidal bore that reverses the flow of the river and slows the earth’s spin each day These Brazilians are about to surf in a very unlikely place: the Amazon River. During full ...