Visible from space, Africa's Great Rift Valley runs three thousand miles from the Red Sea to the mouth of the Zambezi.

The Great Rift Valley channels a huge diversity of waterways - rivers, lakes, waterfalls, caustic springs and coral seas - spanning from Egypt to Mozambique. Some lake and ocean deeps harbour previously unseen life-forms, while caustic waters challenge life to the extreme.

The Great Rift Valley provides the stage for an epic battle between trees and grass - its course influenced by volcanic eruptions, landscape and rainfall. On its outcome rests the fate of Africa's great game herds.

The history, wildlife and exploration of the River Nile.

Since the dawn of history the miraculous annual floodwaters have risen to transform the desert into a fertile paradise where the great civilisation of Ancient Egypt grew, but their existence was on a knife-edge held hostage by the river and the Pharaoh maintained the balance by appeasing the gods to ensure the gifts of the river.

The annual flooding of the Nile brought the water and fertile volcanic soil that made the Ancient Egyptian civilisation possible, but impassable rapids made it impossible for them to discover the source of this bounty they attributed to the gods.

From the heart of Africa to the Mediterranean Sea runs the world’s longest river. Since the Egyptians first settled along its banks men have dreamt of discovering where the Nile was born, but for centuries the river kept its secrets close. The obsession grew and by the mid-19th century some were prepared to risk their lives to be the first to discover the source of the Nile.

A documentary series in which expert scientific testimony and stunning CGI visuals combine to create the most realistic perfect storms imaginable. This edition speculates on what could happen if a mega-tornado were to strike.

China is a vast country with an astonishingly diverse landscape. Through unprecedented access, this six-part series reveals the little-known natural treasures and secret wildlife havens of China's wildest regions.

Ancient, dramatic and full of bizarre animals, Australia is like no other place on earth. Wild Down Under explores the extraordinary landscapes and breathtaking array of strange and often dangerous wildlife that lives around this beautiful continent.

A natural history portrait of a year in Yellowstone, following the fortunes of America's wildlife icons as they face the challenges of one of the most extraordinary wildernesses on Earth.