Mars 2 Billion Years Ago

There might have been giant oceans on Mars 2-3 billion years ago.

The ocean may have covered a third of the Martian surface during
the first half of the planet's history before disappearing at least 2
billion years ago for unknown reasons, the researchers said.

It would be very interesting to figure out why these oceans of Mars boiled away. My money is on global warming caused by George Bush? In any case here is a picture of Mars 2 billion years ago.