Cassini: Titan Flyby on April 30

http://saturn.jpl.nasa.gov/news/even...0430/index.cfm

Titan Flyby - Apr. 30, 2006

Cassini's powerful radar, which can see through Titan's many
haze layers, will image across an optically-bright,
continent-size region of Titan known as Xanadu on April 30,
2006.

It is unclear whether Xanadu is a mountain range, giant basin,
smooth plain, or a combination of all three.