walled plain

noun

a circular or almost circular area on the moon, sometimes with a floor that is depressed, usually partially enclosed by walls that rise to varying heights and that are usually lower than those of a crater.

walled plain

any of the largest of the lunar craters, having diameters between 50 and 300 kilometres

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Moving almost due south, we passed the large but partially ruined walled plain known as Maginus.

It was a wonderful sunset effect in that mountain-dotted, mountain-walled plain, the San Luis Valley.

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