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[S 7206] Iron-rich estuary. Aerial view of a bright orange river running into the sea. This vivid colouration is caused by a suspension of iron-containing minerals in the water. These minerals leach out of the iron-rich volcanic rocks through which the river flows. Photographed in the Landeyjarsandur region, Iceland. (KEYSTONE/SCIENCE PHOTO LIBRARY/BERNHARD EDMAIER) === === [Stockbild-Archiv]