Southeast quadrant of Parch Moon.
"We call it the DEATH RUN! Rev it up as you gaze upon the crater, brave the jump into the caverns later. Uphill slalom though the tricky chicanes to the summit of the mighty vantage plane. Another jump here, if you dare to take it, but you don't have to in order to make it. You rumble out the crannies on your glowin' hot tires, and put the pedal to the metal 'til you reach the Balefire."