In this colour image, acquired using the High Resolution Stereo Camera (HRSC), operated on board ESA’s Mars Express spacecraft by the German Aerospace Center (DLR), a collection of craters of varying ages and at different stages of erosion can be seen. One very large impact crater some 70 kilometres in diameter, with a fairly steep, raised rim, dominates the left (southern) half of the image. A large field of black dunes has formed on the crater floor. The dark material in these dunes probably originates from the erosion of basalt, a dark volcanic rock, and was carried there by the wind. This image was created using data acquired by the high-resolution nadir channel and the colour channels of HRSC. North is to the right.