Opportunity has arrived at "Lewis and Clark Gap" with a new view to the south. It is about to leave Marathon Valley for good and head south into the next valley. This marks the beginning of the current extended mission plan. At the end of the drive on sol 4482, Opportunity parked in a saddle between Knudsen and Wharton Ridges here on the west rim of Endeavour crater. Terrain is steep and there are places that we will continue to avoid in order to preserve drive options. It is easy to go down, but can be impossible to go back up slope if you are not careful. This is another planet and we are blazing a trail like Lewis and Clark.