Birkeland

[lunar crater] This crater has not been significantly eroded, and the outer rim is well-defined with a well-terraced inner walls around much of the interior. The rim has a slight inward bulge along the north where it is attached to the Van de Graaff formation. The interior floor is relatively level, except in the southeast where there is so...
Found on http://en.wikipedia.org/wiki/Birkeland_(lunar_crater)
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