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Oceanus Procellarum
O·ce·a·nus Pro·cel·lar·um [ ssee nəss pròssə lrəm ] vast lunar lowland plain stretching between Mare Imbrium and Mare Humorum, visible as a dark area in the northwestern quadrant of the Moon.
Area: 2,000,000 sq km (775,000 sq mi.) 
Encarta® World English Dictionary [North American Edition] © & (P)2009 Microsoft Corporation. All rights reserved. Developed for Microsoft by Bloomsbury Publishing Plc.
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