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Among the best examples of enclosed Maria is the Mare Crisium, which is considered by Neison to be the deepest of all, and the Mare Humboldtianum. Though these great plains are described as level, this term must only be taken in a comparative sense.
Then on the equator, in north latitude 5° and west longitude 25°, appeared the Sea of Tranquillity, Mare Tranquillitatis, occupying 121,509 square leagues of surface; this sea communicated on the south with the Sea of Nectar, Mare Nectaris, an extent of 28,800 square leagues, in south latitude 15° and west longitude 35°, and on the east with the Sea of Fecundity, Mare Fecunditatis, the vastest in this hemisphere, occupying 219,300 square leagues, in south latitude 3° and west longitude 50°. Lastly, quite to the north and quite to the south lie two more seas, the Sea of Humboldt, Mare Humboldtianum, with a surface of 6,500 square leagues, and the Southern Sea, Mare Australe, with a surface of 26,000.
For away to the north, on the borders of the Mare Frigoris, or Icy Sea, is seen the small Mare Humboldtianum, or Humboldt Sea, with a surface of about 10 thousand square miles. Corresponding to this in the southern hemisphere lies the Mare Australe, or South Sea, whose surface, as it extends along the western rim, is rather difficult to calculate.
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