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A Map of the Chief Plains and Craters of the Moon

A Map of the Chief Plains and Craters of the Moon.jpg Outline plan of PompeiiThumbnailsThe World as known shortly before the sailing of ColumbusOutline plan of PompeiiThumbnailsThe World as known shortly before the sailing of ColumbusOutline plan of PompeiiThumbnailsThe World as known shortly before the sailing of ColumbusOutline plan of PompeiiThumbnailsThe World as known shortly before the sailing of ColumbusOutline plan of PompeiiThumbnailsThe World as known shortly before the sailing of ColumbusOutline plan of PompeiiThumbnailsThe World as known shortly before the sailing of ColumbusOutline plan of PompeiiThumbnailsThe World as known shortly before the sailing of Columbus

The plains were originally supposed to be seas: hence the name "Mare."