megan
Many thanks, Interestingly(?) it's one of the few unofficial place names the astronauts used that the International Astronomical Union have retained on current charts.
http://www.space.com/23140-moon-land...stronauts.html
(Edit to add this rather than bring an old thread back to the top: This thread got me reading "First on the Moon" from cover to cover again after a very long time - lo and behold, page 242: "Tranquillity Base! That was not in the flight plan; nobody in mission control had known Neil Armstrong would call it that,.......")