This colour plan view was created using data from the nadir channel, which is directed vertically down onto the Martian surface, and the colour channels of the High Resolution Stereo Camera (HRSC) on board ESA's Mars Express spacecraft. The data was acquired at approximately 17 degrees south and 296 degrees east during orbit 11,467 on 4 January 2013. The image shows two 50-kilometre craters located on Thaumasia Planum, just south of Valles Marineris. North is to the right of the image; the ground resolution is approximately 25 metres per pixel. The northern crater is named Arima, while the southern crater is unnamed. Both craters exhibit central depressions thought to have been caused by underground steam explosions during the impact events that formed them.
As a joint undertaking by DLR, ESA and FU Berlin, the Mars Express HRSC images are published under a Creative Commons licence since December 2014: ESA/DLR/FU Berlin, CC BY-SA 3.0 IGO. This licence will also apply to all HRSC images released to date.