Valley Geometry (IMAGE) ETH Zurich Caption The central portion of Osuga Valles, which has a total length of 164 km. In some places, it is 20 km wide and plunges to a depth of 900 m. Credit Photograph: ESA/DLR/FU Berlin, CC BY-SA 3.0 IGO Usage Restrictions None License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.