Elevation map of the Jezero Crater, landing site of the Perseverance Rover. Jezero Crater is an uneven half-circle where the Northeast side is worn away. There are countless craters like it on Mars, yet Jezero was selected over 30 other candidates as the new playground for NASA’s Perseverance Rover. The deltas formed by the river inlet are at the center of the Perseverance mission. Based on the sediment accumulation rates in lakes on earth, Jezero Crater may have been active for between 1 and 10 million years.