He also created the River Avon Mud Circle at Bristol's M Shed museum in April 2011.

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We find that tracks left in the mud of river beds are the easiest to track.

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PCBs are now embedded at the bottom of the river, getting buried under more and more mud as time goes on.

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Rachel McDonald, the pub's owner, said there was "lots of mud everywhere" and said the river had been blocked by a fallen tree trunk.

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French soldiers will spend the coming days combing the 20km valley with the help of Malian soldiers and police officers who will first go into the nomad camps and mud houses which line the dry river basin.

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We made it down a hill, through 6 inches of mud, crawled across a ledge, across a river and through a scary tunnel to get to the other side.

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How can this be worse than sleeping on top of her parents' graves, saying Kaddish so many times the words ran together like nonsense, worse than sitting for days by the Pripiat River, watching for a little sock or Sophie's blue petticoat, sitting in the mud in only a nightgown and blanket, until the weather changed and Mariam came with the flier for America?

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Its colour comes not from pollution but from mud and sunlight as the Darling slowly wends its way between narrow, steep banks to meet the Murray River and then the ocean 2, 400km south.

ECONOMIST: A land of drought