Titan s Land of Lakes . ... Credit Copyright: Cassini Radar Mapper , JPL , USGS , ESA , NASA Explanation: Saturn's large moon Titan would be unique in our solar system, the only world with stable liquid lakes and seas on its surface ... except for planet Earth of course. ... Roughly heart-shaped, the lake above and right of the pole is Ligeia Mare, the second largest known body of liquid on Titan and larger than Lake Superior on Earth . Just below the north pole is Punga Mare. ...