In 2006, a NASA spacecraft flew by Saturn’s largest moon and found evidence of large bodies of liquid on the surface of the bizarre world. The shocking discovery meant that Titan’s landscape is eerily similar to that of Earth’s; the two worlds are the only ones known to have rivers, lakes, and seas on the surface.
https://gizmodo.com/saturn-moon-titan-methane-ethane-waves-sculpting-shore-1851547416