This film tells the story of redressing a problem. People in Europe have been straightening rivers for hundreds of years, drying floodplains and destroying the landscape near rivers. 
This has resulted in a drastic decline in the variety of species near and in rivers. But there is hope on the horizon from an unexpected source: of all things, as a result of human intervention, which played a part in destroying the natural surroundings: gravel pits. 
This film takes viewers into a world, which they could hardly imagine was possible. This world is so close and yet so unfamiliar; it has been artificially created, but is full of natural beauty.