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Northeast from this lay Oceanus Procellarum, the Ocean of Tempests, the most extensive of all the plains on the lunar disc, embracing a surface of about half a million of square miles, its centre being in 10° north and 45° east. From its bosom those wonderful mountains Kepler and Aristarchus lifted their vast ramparts glittering with innumerable streaks radiating in all directions.
The Oceanus Procellarum also presents good instances of ridges in the marvellous ramifications round Encke, Kepler, and Marius, and in the region north of Aristarchus and Herodotus.
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