This image captured by NASA 2001 Mars Odyssey spacecraft shows part of the large sand sheet with surface dune forms on the floor of Charlier Crater in Terra Sirenum. Orbit Number: 67288 Latitude: -68.1351 Longitude: 191.161 Instrument: VIS Captured: 2017-02-13 09:50 https://photojournal.jpl.nasa.gov/catalog/PIA21526