Images captured by the Mars Rover Perseverance in an area nicknamed Skrinkle Haven in Jezero Crater on Mars indicate the presence of a river that flowed into that crater in ancient times. The surprise is that the layers of sediments and pebbles that form what was called a curvilinear unit suggest that that river was deeper and more powerful than all other ancient Martian rivers identified so far. A hill nicknamed Pinestand about 450 meters from Skrinkle Haven may have been formed by a powerful river but scientists are assessing other explanations as well.