EUROPEAN SPACE AGENCY / SCIENCE PHOTO LIBRARY EUROPEAN SPACE AGENCY / SCIENCE PHOTO LIBRARY
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Lena Delta, satellite radar image. North is at top. This river flows 4400 kilometres from south-central Russia, to this delta on the Arctic coast of north-west Russia. At the delta, the water spreads out through numerous channels, depositing its silt to build the land of the delta, before emptying into the Laptev Sea. The delta is frozen in the winter, but in summer it is a thriving wetland. This composite of three images was obtained in 2007 and 2008 from the ASAR (Advanced Synthetic Aperture Radar) instrument on the European Space Agency's (ESA) Envisat (Environmental Satellite).
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