ESA has published new photos of the Kasei Valles channel system on Mars captured by the Mars Express space probe’s High Resolution Stereo Camera (HRSC) instrument. The collected data indicate that Kasei Valles were generated by a series of mega-floods and not by a continuous water flow on the surface. Today this system of channels is one of the largest on Mars and extends for 3,000 kilometers (almost 1,900 miles) from Echus Chasma, near Valles Marineris, up to Chryse Planitia.