Endeavour Crater (Natural Colors; credits: Lunexit)

The largest crater in this mosaic of images taken by the Context Camera on NASA's Mars Reconnaissance Orbiter is Endeavour Crater, which is approx. 22 Km (about 14 miles) in diameter.
The team operating NASA's Mars Exploration Rover Opportunity in the Meridiani Planum Region of Mars chose to drive the Rover toward Endeavour after Opportunity ascended out of smaller Victoria Crater in August 2008.
Opportunity caught its first glimpse of Endeavour's rim on March 7, 2008, during the 1820th Martian Day, or Sol, of the Rover's Mission on Mars. The Rover was about 12 Km (approx. 7 miles) from the closest point of Endeavour.