Great Sandy Desert, satellite image. North is at upper left. Vegetation is green and purple, while more barren, rocky areas are various shades of white and brown. A lake is seen at bottom right, and several rivers are also seen. The varied colours here reflect the complex geology of the areas, with different rock types showing in different colours. This area, the western region of Australia's Great Sandy Desert, is almost devoid of sand. The area shown in this image is around 174 kilometres wide. The image data includes infrared wavelengths, and was obtained on 24 February 2001, by the Landsat 7 satellite.