The largest rainforest in the world, the Amazon rainforest, exists between two rivers: one below, and one above. The Amazon River is on ground level, weaving its way through one of the most complex ecosystems in the world. Above the canopy, invisible "flying rivers" transport huge quantities of water vapour from the Amazon Basin to other parts of South America. These cloud masses, unexceptional at a first glance, contain more water than the Amazon River itself.
What is a flying river?
