On what moon or planet can XXX be found?
Ravi Vallis
Ravi Vallis is an ancient outflow channel, the source of which originates from the Aromatum Chaos depression, and is situated at the eastern end of Xanthe Terra, in the Margaritifer Sinus quadrangle (MC-19) region of Mars, located at 0.2°S 40.7°W. The Ravi Vallis outflow channel is 205.5 km (127.7 mi) long, and starts at the northeastern end of the Aromatum Chaos depression.
Mars