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Oceanus Procellarum

Ocean of Storms, Mare on the Moon

A vast grey plain in the Moon's western hemisphere. Its appearance on the Moon's face during the second quarter was thought to herald bad weather, hence its name. Around its edges are numerous minor seas and bays, of which the largest is the southern Mare Nubium, the Sea of Clouds. Its northern edge is defined by the line of the Carparthian Mountains, which separate it from the huge Mare Imbrium.

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