A permanent springfed pool near the salt pans at Badwater Basin, 282ft below sea level and the lowest place in North America, Death Valley National Park, California, United States of America, North America

Clay loaded with iron oxides and dried out, Rio Tinto, Andalusia, Spain *** Local Caption *** R?o Tinto ("Red River") is very acidic (Ph 2) and has a deep reddish hue due to iron dissolved in water. The acidity of the watercourse is linked to the drainage of pyrite, which is very present in the subsoil. Extremophilic and endemic bacteria and algae colonize the river bed, forming a fragile biofilm that evokes the hot springs of Yellowstone Park in the USA.

Eurasian wild boar (Sus scrofa ) piglets were part of a group of 5 running on a dry arm of the Loire River, Loire Valley, France

Eurasian wild boar (Sus scrofa ) piglet was part of a group of 5 running on a dry arm of the Loire River, Loire Valley, France

African Elephant (Loxodonta africana). So-called desert elephant. Cow in the dry bed of the Ugab river. Damaraland, Namibia.

South African giraffe or Cape giraffe;Giraffa giraffa) or;Giraffa camelopardalis giraffa). Mashatu Game Reserve. Northern Tuli Game Reserve. Botswana.

Springbok (Antidorcas marsupialis). During a sandstorm in the dry bed of the Nossob river. Kalahari Desert, Kgalagadi Transfrontier Park, South Africa.

Eurasian wild boar (Sus scrofa) crossing a dry arm of the Loire River, Loire Valley, France

Roedeer (Capreolus capreolus) crossing a dry arm of the Loire River, Loire Valley, France

Coypu (Myocastor coypus) crossing a dry arm of the Loire at dawn, Loire Valley, France

Red-billed Quelea (Quelea quelea) in the bed of the Luangwa river in South luangwa NP, Zambia