This three-dimensional stereo anaglyph was created from several frames from the navigation camera on NASA's Mars Exploration Rover Opportunity. It is presented in a cylindrical-perspective projection. The rover acquired these frames during its 115th martian day, or "sol," in the Meridiani Planum region of Mars, on May 21, 2004. The rover was near the edge of "Endurance Crater," which dominates the right half of this view. The crater is about 130 meters (about 430 feet) in diameter.