Watch on Soap2day. Although it crosses six countries and is over 3,500 kilometers long, the Zambezi is one of the least known rivers in the world. So it's time to take to the water and discover this mystical, ever-changing river, whose mood changes from day to day, kilometer to kilometer, and which is the very essence of life for millions of animals and people in this often drought-stricken, water-scarce region!