The evidence was found in a place expected to be dry.
https://metro.co.uk/2023/02/13/nasa-finds-clearest-evidence-of-ancient-lake-on-mars-18272745/?utm_source=dlvr.it&utm_medium=blogger
https://metro.co.uk/2023/02/13/nasa-finds-clearest-evidence-of-ancient-lake-on-mars-18272745/?utm_source=dlvr.it&utm_medium=blogger