This Envisat image shows western India and southern Pakistan, with the Indus River snaking through Pakistan’s Sindh province before emptying into the Arabian Sea. The red area in the lower-central portion of the image covers a seasonal salt marsh over Pakistan’s border with western India.

This image is a compilation of three passes by Envisat’s radar on 15 May, 14 July and 12 September 2011. Each is assigned a colour (red, green and blue) and combined to produce this representation. The colours reveal changes in the surface between Envisat’s passes.