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.
Words nearby walled plain
wallaroo,
wallasey,
wallboard,
wallcovering,
walled,
walled plain,
wallenberg,
wallenda,
wallensis,
wallenstein,
waller
British Dictionary definitions for walled plain
walled plain
noun
any of the largest of the lunar craters, having diameters between 50 and 300 kilometres