The Tiu Valles are an outflow channel system in the Oxia Palus quadrangle of Mars, centered at 16.23° North and 34.86° West. They are long and were named after the word for "Mars" in Old English (West Germanic). See also Chaos terrain Geology of Mars HiRISE Martian chaos terrain Outburst flood Outflow channels References Further reading Valleys and canyons on Mars Oxia Palus quadrangle