The Ocean of Storms can be seen at the top of this lunar orbital image, with the Known Sea at the bottom. The rugged highland region of the Riphaeus Mountains bisects the two, having been high enough to have survived the lava flooding that created this vast volcanic plain. North is to the top right; the seven-mile-wide crater Euclides is to the top left. Metric mapping camera black-and-white negative by Kenneth Mattingly, Apollo 16, April 16-27, 1972. Photos courtesy NASA; digital scanning and image processing © 1999 Michael Light Studio