India's mighty Ganges, a river revered by a billion Hindus as a living goddess, is in trouble. Jeremy is on a 1,500 mile mission to investigate the problems first-hand to find out what is being done to save this holy river.
The Amazon is the mightiest of all rivers, but it is also under immense pressure. Jeremy traces the annual migration of the Dorado catfish and discovers the issues that are putting this river at risk from leaking pipelines to impassable dams.
The Danube's scenic route through ten European countries has made it a tourist magnet. But poachers, invasive species and engineering projects have made it one of the most endangered rivers on Earth. Jeremy Wade investigates what can be done to save it.
The mighty Mississippi is threatened on several fronts - from alien invaders pushing out native species, to vast blooms of green algae strangling life from the river. Jeremy Wade meets scientists, fishermen and leaders fighting to save the river.
Wild and unnavigable, Africa's Zambezi boasts the world's mightiest waterfall, heart-pounding rapids and man-eating crocs. From the upper reaches in Zambia to the delta in Mozambique, Jeremy investigates the threats to this mighty river.
China's Yangtze River is threatened by over-fishing, industrial pollution and the loss of iconic monster fish. Jeremy Wade travels upstream to find out if there are any fish left, and meets the heroes fighting for the future of the river.