This image of Ligeia Mare, one of the ethane and/or methane "seas" on Titan, was created with radar data from the Cassini spacecraft. The image has been artificially colorized; liquid ethane/methane is shown in blue, areas of "dry land" are brown. This sea is near Titan's North Pole, and is slightly larger (in area) than Lake Superior on Earth.
Image courtesy of NASA/JPL/USGS.