The Mars Exploration Rover Opportunity arrived at the red planet on January 25, 2004. It landed in Eagle Crater in a region called Meridiani Planum. The map reveals the rover's journey (gold line) across the Martian surface. On March 24, 2015 (Opportunity’s 3,968th Martian day, or sol) the rover had driven 42.2 kilometers (26.2 miles)—almost exactly the length of an Olympic marathon.
NASA/Jet Propulsion Laboratory-Caltech/MSSS/NMMNHS