This is the left-eye half of a stereo pair of views looking toward the northeast across "Endurance Crater" in Mars' Meridiani Planum region. It was assembled from frames taken by the navigation camera on NASA's Mars Exploration Rover Opportunity during the rover's 131st martian day, or sol, on June 6, 2004. That was two sols before Opportunity entered the crater, taking the route nearly straight ahead in this image into the "Karatepe" area of the crater. This view is a cylindrical-perspective projection with geometric seam correction.
See PIA06057 for 3-D view and PIA06059 for right eye view of this left eye cylindrical-perspective projection.