The European Space Agency's ExoMars Trace Gas Orbiter spied a salt deposit on Mars that likely indicates water once flowed there, in a region known as the "Sea of the Sirens."

Mars orbiter hears the siren song of a salty Red Planet 'mermaid'

Source: space
Source Link: https://www.space.com/mars-esa-exomars-sea-of-the-sirens