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Oceanus Procellarum, Latin for "Ocean of Storms", is a vast lunar mare on the western edge of the near side of Earth's Moon. Its name derives from the old superstition that its appearance
during the second quarter heralded bad weather. Procellarum is the largest of
the lunar maria, stretching 2500 kilometers across its north-south axis and covering roughly 4,000,000 km2.
Like all lunar maria, Oceanus Procellarum was formed by ancient basaltic flood
volcanic eruptions that covered the region in a thick, nearly flat layer of
solidified magma. Unlike the other lunar maria, however, Procellarum is not contained
within a single well-defined impact basin (although much of it is within the Procellarum Basin). Around its
edges lie many minor bays and seas, including Mare Nubium and Mare Humorum to the south. To the northeast, Oceanus Procellarum is separated from
Mare Imbrium by the Carpathian Mountains.
The unmanned lunar probes Surveyor 1, Surveyor 3, Luna 9 and Luna 13 landed in Oceanus Procellarum. Apollo 12 also landed in Oceanus Procellarum.
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