This image shows the locations of some of the geological structures and landforms described in the text. In the left half of the image, the broad and flat valleys of Protva Valles ('broader valleys') can be seen. At the top of the image is a deeply incised valley, probably formed by a tectonic fault. In the grabens in the rectangle in the centre of the image, light-coloured dust and sand have been deposited ('fractures filled with light-toned dust'). The transverse rectangle is characterised by intensively eroded valleys. Wrinkle ridges are typical of landscapes where thin lava is compressed to form long ridges during solidification.