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Updated: May 17, 2025
Away to their left appeared Helicon, a ring mountain about 1600 feet high; and still further to the left the eye could catch a glimpse of the cliffs enclosing a semi-elliptical portion of Mare Imbrium, called the Sinus Iridium, or Bay of the Rainbows.
The Sinus Iridum highlands, bordering the beautiful bay on the north-east side of the Mare Imbrium, rank among the loftiest and most intricate systems on the moon, and, like the Apennines, present a steep face to the grey plain from which they rise, though differing from them in other respects.
The Mare Serenitatis is encircled by mountain ranges to a greater extent than any of the other lunar "seas." On its eastern side the Caucasus and the Apennines shut it in, except for a strait a hundred miles broad, by means of which it is connected with the Mare Imbrium.
"We need all our wits; your strong Martian drinks are dangerous. Look here, I'll tell you just how the situation stands " I plunged into a glib account of our supposed wanderings to find the Grantline camp: its location off the Mare Imbrium hidden in a cavern there. Potan, with the drink, and under the gaze of Anita's eyes, was in high good humor.
The wonderful complexity of its bright streaks diverging on all sides from its centre presented a scene alike splendid and unique. These streaks, the travellers thought, could be traced further north than in any other direction: they fancied they could detect them even in the Mare Imbrium, but this of course might be owing to the point from which they made their observations.
Others, again, of considerable area, as, for example, the Mare Serenitatis and the Mare Imbrium, are bounded more or less completely by curved borders, consisting of towering mountain ranges, descending with a very steep escarpment to their surface: thus in form and other characteristics they resemble immense wall-surrounded plains.
As though to answer my lie, from down on the Earthlit plains, some ten miles or so from the crater base, a tiny signal light shot up. Anita saw it and gripped me. "There is Miko's light!" It spelled in Martian, Come down. Land Mare Imbrium. Miko had seen the signaling up here and had joined it! He repeated, Land Mare Imbrium. I flashed a protest up to the ship: Beware. That is Grantline! Trickery.
They would wait for Miko and his men to make their whereabouts known. Miko's encampment was ahead of us now, undoubtedly. We had been following him toward the Mare Imbrium. Or at least, we hoped so. He would signal his ship. But Anita and I, closer to it, would also signal it; and, posing as brigands, would join it! "Remember, Gregg, I remain Anita Prince, George's sister."
To the north, in the direction of Mare Frigoris, extends Mare Imbrium, the Sea of Rains, its central point in 35° north and 20° east. It is somewhat circular in shape, and it covers a space of about 300 thousand square miles.
The peculiarity of the northeastern quadrant which immediately strikes the eye is the prevalence of the broad plains called Maria, or "seas." The northern and central parts are occupied by the Mare Imbrium, the "Sea of Showers" or of "Rains," with its dark bay the Sinus Æstuum, while the eastern half is covered by the vast Oceanus Procellarum, the "Ocean of Storms" or of "Tempests."
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