Definition: Given a context passage, generate a question from the passage such that its answer is shortest continous span from the passage.
Input: Mad Vallis is a valley in the Hellas quadrangle of Mars, with its location centered at 56.5 S and 283.9 W. It is 524 km long and was named after the Mad River in Vermont, USA.
Output:
On what moon or planet can Mad Vallis be found?