Yukon Delta
This Envisat image features Alaska’s Yukon Delta, where the Yukon River fans out into a labyrinth of distributaries before emptying into the Bering Sea. The Yukon, North America’s fifth-longest river system, flows some 3,190 km across central Alaska in the US before emptying into Norton Sound (top left).
This image was created by combining three of Envisat's Advanced Synthetic Aperture Radar (ASAR) acquisitions (Nov. 19, 2009, April 8, 2010 and May 13, 2010) over the same area. The colors represent changes in the surface between acquisitions.
Image and caption: ESA