Cassini has returned images of an ancient lake in the Galilee basin, which is now under water.
The images were taken in April 2015, just three months before the craft landed on the surface.
The lake is called Polyus, and was formed by the impact of a meteorite that hit the surface about 4 billion years ago.
The lander has found that the lake is about 10 metres deep, with several ponds of liquid that could be the result of water being sucked out of the lake by a volcanic eruption, according to the team of scientists involved in the study.
Scientists hope to use the images to find out more about how the ancient lake was formed.
The Cassini spacecraft is currently in orbit around Saturn, in the Enceladus system, to search for water and ice trapped in Saturn’s icy shell.
It is due to be pulled into orbit around the planet by a powerful tidal pull from the Sun in 2021.