walled plain
- 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.
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Dictionary.com Unabridged
Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
walled plain
- any of the largest of the lunar craters, having diameters between 50 and 300 kilometres
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Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
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