Iberus Vallis is a valley in the Elysium quadrangle of Mars, located at 21.5° N and 208.0° W. It is 80.2 km long and was named after a classical name for the Ebro River in NE Spain.[1]
Detail from the center of the previous image, as seen by HiRISE.
Wikimedia Commons has media related to Iberus Vallis.