Lakes of Titan
The Cassini-Huygens probe flew by in February, 2007, taking radar and camera pictures of some large areas near the north pole that may be large areas of liquid methane and/or ethane, including one sea larger than 100,000 km² (larger than Lake Superior), and another area similar in size to the Caspian Sea. Pictures taken near Titan's southern pole in October 2007 showed similar, but far smaller, areas that look like lakes.