Geological period: Eratosthenian (From -3.2 billions years to -1.1 billions years)
Dimension: 129.0x129.0Km / 78.0x78.0Mi
Height: 4800.0' / 14500.0ft
Virtual Moon Atlas says that it is in the northwest quadrant, not southwest.
What do I win?
BTW, decent photo

Brian