https://www.cnet.com/news/scientists-finally-know-where-theyre-sending-the-new-mars-rover/ > However, a second site, Mawrth Vallis, is still in contention for the ExoMars landing site, though it appears Oxia Planum will get the nod because it provides a slightly safer option, with few challenging topographical challenges or slopes. Mawrth Vallis was one of the sites considered for NASA's Curiosity mission and their Mars 2020 mission because, like Oxia Planum, it is rich in clay minerals. > The location of Oxia Planum (green) and Mawrth Vallis (blue, top) on the Martian surface.