At first, I thought this was a river. The censors had darkened it. Then my eyes caught sight of the tide. This is clearly an ocean coastline on Mars. Much of their oceans are frozen on the surface & thaw somewhat in the summer.
I removed the false coloring & censor darkening & used a contrast tool to bring out details.
The red arrow points to the tide. This is a shoreline beach. Those are craft in flight not craters There are fisheries to the left.