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Mare Humboldtianum

Mare Humboldtianum (sea of Alexander von Humboldt) is a lunar mare 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.