Stura Vallis, as seen by HiRISE. Scale bar is 500 meters long.
Stura Vallis is an ancient river valley in the Elysium quadrangle of Mars, located at 22.9° north latitude and 217.6° west longitude. It is 75 km long and was named after a classical river east of Rome, Italy.
Original source: https://en.wikipedia.org/wiki/ Stura Vallis. Read more