The complex dune forms in this VIS image are located on the floor of Russell Crater. The large ridge dune is unique to Russell Crater. Russell Crater is located in Noachis Terra and is 135km (83miles) in diameter. Orbit Number: 83200 Latitude: -54.3721 Longitude: 12.9113 Instrument: VIS Captured: 2020-09-15 23:24 https://photojournal.jpl.nasa.gov/catalog/PIA24242