This VIS image shows part of Sacra Mensa, a large mesa located between the north and south channels of Kasei Valles. The linear feature at the top of the image is one of the many graben found in the mesa and surrounding highlands. Graben are formed by the downward motion of a block of material between paired tectonic faults. Sacra Mensa rises 3 km (almost 2 miles) above Kasei Valles. Orbit Number: 79203 Latitude: 26.0793 Longitude: 294.1 Instrument: VIS Captured: 2019-10-22 21:34 https://photojournal.jpl.nasa.gov/catalog/PIA23634