A patera is an irregular crater, or a complex one with scalloped edges. Usually the dish-shaped depression atop a volcano. On Triton they are named after aquatic names, excluding Roman and Greek. Possible categories include worldwide aquatic spirits, terrestrial fountains or fountain locations, terrestrial aquatic features, terrestrial geysers or geyser locations, terrestrial islands.
Sorry, there hasn't been a good map made for this world yet :(