The Bay of Rainbows . ... Credit Copyright: Alan Friedman Explanation: Dark, smooth regions that cover the Moon's familiar face are called by Latin names for oceans and seas. ... Ringed by the Jura Mountains (montes), the bay is about 250 kilometers across, bounded at the bottom of the rugged arc by Cape ( promontorium ) Laplace. The cape's sunlit face towers nearly 3,000 meters above the bay's surface. ... NASA Web Site Statements, Warnings, and Disclaimers . NASA Official: Jay Norris. ...