To the left of the image is Melas Chasma, a part of the huge Valles Marineris rift valley, which stretches for more than 4000 km across the face of Mars. Melas Chasma itself sinks 9 km below the surrounding plains, on the right of the image, making it one of the lowest depressions on Mars. This image covers 200 x 100 km and covers an area of roughly 20 000 sq km, which is about the size of Slovenia.