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http://www.iflscience.com/space/titans-polar-seas-glint-sunlight
However, the latest image is the first to combine the two. With three small exceptions, Titan's lakes and seas sit in the northern polar region, and through the hemisphere's long winter the sun never reached them. “Specular reflections can only be seen when the Cassini spacecraft is in the right place relative to the sun and Titan such that the mirror-like reflection from a lake reflects sunlight directly to the spacecraft," NASA pointed out when the first reflection images were released. "They require the sun to be above the horizon at the location of the lake, which is why none were visible until after Titan's northern spring equinox in 2009 when the seas became illuminated,â€