Amphitrites Patera is an old volcanic complex located south of Hellas Planitia. The surface in this VIS image has a unusual texture, one seen more commonly on the nearby south polar ice. The surface appears to be eroding in a fashion that creates small circular features which grow and coalesce into larger circles. Orbit Number: 74545 Latitude: -57.6389 Longitude: 66.7121 Instrument: VIS Captured: 2018-10-04 06:51 https://photojournal.jpl.nasa.gov/catalog/PIA22854