Sea on Titan (left) compared with Lake Superior on Earth (right). The sea is the largest body of surface liquid found on Titan, and at over 100,000 square kilometres is larger than Lake Superior (82,000 square kilometres). Although some four times smaller than the Black Sea, Earth's largest inland sea, it covers proportionally more of the surface as Titan is smaller than Earth. The sea, and other similar lakes, are thought to contain a mixture of methane and ethane, which interact with the atmosphere much as water does on Earth. Titan image from the Cassini spacecraft on 22nd February 2007. Lake Superior image by the SeaWiFS sensor on the OrbView-2 satellite.