Mare Humboldtianum (sea of
Alexander von Humboldt) is located within the Humboldtianum basin, just to the east of
Mare Frigoris. The basin material is of the
Nectarian[?] epoch, with the mare material being of the
Upper Imbrian[?] epoch. The lighter gray area to the southeast of the dark mare material is a region of hills within the basin.
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