<Li> Mare Incognitum ("Unknown Sea") </Li> <Li> Mare Novum ("New Sea"), northeast of Plutarch </Li> <Li> Mare Struve ("Struve's Sea"), near Messala </Li> <P> A related set of features are the Lunar lacus (singular lacus, Latin for "lake"), which are smaller basaltic plains of similar origin: </P>

Of storms largest of the dark plains on the surface of the moon