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Next in order of size come the Mare Nubium, of about one-fifth the superficies, covering a large portion of the south-eastern quadrant, and extending considerably north of the equator, and the Mare Imbrium, wholly confined to the northeastern quadrant, and including an area of about 340,000 square miles. These are by far the largest lunar "seas."
Even at 30° S., only ten degrees farther north than the latitude of Tycho, the travellers had considerable difficulty, comparatively, in observing the details of Pitatus, a walled mountain on the south shores of the Mare Nubium.
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