BERNHARD EDMAIER / SCIENCE PHOTO LIBRARY BERNHARD EDMAIER / SCIENCE PHOTO LIBRARY
River delta. Aerial photograph of the Ord River Delta in Western Australia, at low tide. The Ord River (blue) branches across this tidal plain. The banks of the river are coloured grey by mud carried by the moving water. A delta is a fan- shaped accumulation of sediment at the mouth of a river, where it meets a lake or the sea.
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