PLANETOBSERVER / SCIENCE PHOTO LIBRARY PLANETOBSERVER / SCIENCE PHOTO LIBRARY
Greater London, satellite image. North is at top. Vegetation is green, water is blue and urbanised areas are grey and pink. London is the most populous city in the European Union. Part of the Thames estuary is at far right. The Medway River, one of its tributaries, joins the River Thames on the south side of the estuary.
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