Chesapeake Bay. Coloured optical and infrared, Landsat satellite image of Chesapeake Bay on the north-eastern coast of the USA. North is at top. Water is blue, vegetation is green and urban areas are purple. Fields and other cultivated areas form a patchwork of pink and green (upper right). Several rivers flow into the bay from the mainland to the left. The largest of these is the Potomac River, which flows down from the purple area at top left. This purple area is Washington D.C., the capital city of the USA. Brown coastal areas (near centre), on the peninsula at right, are marshes that support many thousands of water birds.
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