One of the seas is larger than the Great Lakes
"A NASA spacecraft has found evidence of huge seas, likely filled with liquid methane or ethane, in the high northern latitudes of Saturn's moon Titan.
One of the seas is larger than any of the Great Lakes in North America and possibly only slightly smaller than the Caspian Sea, which lies between Russia and Iran and is the largest lake on Earth. (Lakes are typically landlocked but the Caspian Sea was called a sea when it was initially discovered because it tasted salty.)
The very dark features, detected by a radar instrument on NASA's Cassini spacecraft, are located near Titan's north pole, and one of them measures at least 39,000 square miles (100,000 square kilometers), much larger than similar features seen before on the Saturnian moon."