|The crater Flamsteed, in the SW
corner of the Moon in Section 40, is an extremely interesting target
in that southern part of Oceanus Procellarum. The crater is 21 km wide
and 2160 meters deep and is the largest of the conspicuous craters in that
photo. However, the larger, tear-drop-shaped area in the upper left image
(clearly round in the overhead Lunar Orbiter image at upper right) is the
flooded crater Flamsteed P. On June 2, 1966, Surveyor 1 landed close
to the remains of the NE wall of this crater .