This Envisat radar image features the eastern side of Ellesmere Island (left), the northernmost Canadian island, and portions of the northwest coast of Greenland (right), the world’s largest island. As radar images represent surface backscatter rather than reflected light, there is no colour in a standard radar image. This image was created by combining three Envisat Advanced Synthetic Aperture Radar acquisitions (2 February 2009, 14 April 2009 and 10 November 2009) taken over the same area. The colours in the image result from variations in the surface that occurred between acquisitions.