Fresh water's journey starts here, high in the mountains.
Growing from humble streams to mighty rivers it will travel hundreds of miles to the sea.
Angel Falls, the highest waterfall in the world.
Its waters drop unbroken for almost 1,000 metres.
Such is the height of these falls that long before the water reaches the base in the Devil's Canyon it's blown away as a fine mist.
In their upper reaches, mountain streams are full of energy.
Streams join to form rivers, building in power, creating rapids.
The water here is cold. Low in nutrients, but high in oxygen.
The few creatures that live in the torrent have to hang on for dear life.