This image, taken by the High Resolution Stereo Camera (HRSC) on board ESA’s Mars Express spacecraft, shows Coprates Chasma, a major trough located roughly in the centre of the Valles Marineris canyon system.
The HRSC obtained this perspective view on 28 May 2004 during orbit 449 with a ground resolution of approximately 48 metres per pixel. The scene shows the region of Coprates Chasma and Coprates Catena, over an area centred at about 13.5º South and 300º East, looking north.
The main trough, appearing in the north (top half) of this image, ranges from approximately 60 km to 100 km wide and extends 8-9 km below the surrounding plains. Coprates Catena lies parallel to Coprates Chasma and can be seen in the south (lower half) of the image as three smaller troughs, ranging from a few kilometres to 22 km wide and up to 5 km deep.