Mare Spumans (from Latin: foaming sea) is a lunar mare located just south of Mare Undarum on the lunar near side. It is one of the many elevated lakes contained in the Crisium basin, surrounding Mare Crisium. The surrounding basin material is of the Nectarianepoch, while the mare basalt being of the Upper Imbrian epoch. The craterPetit (formerly Apollonius W) is located on the western rim of the mare. This crater is white and surrounded by a well-defined ray system.
^"Mare Spumans". Gazetteer of Planetary Nomenclature. International Astronomical Union (IAU) Working Group for Planetary System Nomenclature (WGPSN). Archived from the original on 2014-08-24. Retrieved 2015-05-24.