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Four Rivers Episodes Available now
Severn River, UK
Britain's longest river is just 220 miles long, but it is a major source of drinking water
Sarasvati River, India
The mythical river's connection to the goddess Saraswati and its importance in Hinduism
Mississippi River, USA
The river's history, cultural legacy - and iconic steamboats
Niger River, Mali
The river's geography from Niafunk茅 to Bamako, its exotic history and uncertain future
