This image was taken by the European Space Agency’s Mars Express spacecraft, and shows a system of outflow channels called the Dao Valles and Niger Valles; it was taken in June 2004, during the spacecraft’s 528th orbit. The eroded channels are in a region of Mars that’s near the southern flank of the Hadriaca Patera volcano, so they could have been created by fast moving lava “running off” during an eruption.