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(December 2009)| Oceanus Procellarum is the large mare in the
center and upper left of this image. Visible in the upper right
is another large mare, Imbrium, and below is the small round
Mare Humorum. |Diameter||2,592 km (1,611 mi)| |Eponym||Ocean of
Storms| Oceanus Procellarum (pron.: / /; Latin for "Ocean of
Storms") is a vast lunar mare on the western edge of the near
side of Earth's Moon. It is the only one of the lunar maria to
be called an "Oceanus" (ocean), due to its size: Oceanus
Procellarum is the largest of the maria, stretching more than
2,500 km (1,600 mi) across its north-south axis and covering
roughly 4,000,000 km2 (1,500,000 sq mi). 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, Oceanus Procellarum may or may not be contained within
a single well-defined impact basin. Aro