THEMIS Image of the Day, November 22, 2018. Amphitrites Patera is an old volcanic complex located south of Hellas Planitia.
The surface in this VIS image has a unusual “Swiss-cheese” 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.
See more THEMIS Images of the Day by geological subject.