This image from the Envisat satellite shows the Juruá River snaking through the Amazon rainforest in western Brazil. Along the river’s main course are free-standing ‘oxbow lakes’, formed when a river changes course.

This image is a compilation of three images from Envisat’s radar, acquired on 2 January, 1 February and 3 March 2012. The individual images are each assigned a colour – red, green and blue – and when combined, reveal changes in the surface between Envisat’s passes.