Bilbo Colles on Titan, surrounded bu dune fields. Radar image by <a href="https://en.wikipedia.org/wiki/Cassini_(spacecraft)" class="extiw" title="en:Cassini (spacecraft)">Cassini</a>, made during flybys T25 (February 22, 2007) and T28 (April 10, 2007). Size of the image is 160×160 km, north is up. Black region in upper left was out of radar scope.
NASA (Cassini radar images)
2007-04-10
made of Cassini radar images <a rel="nofollow" class="external text" href="http://pirlwww.lpl.arizona.edu/~perry/RADAR/#T25">T25</a> and <a rel="nofollow" class="external text" href="http://pirlwww.lpl.arizona.edu/~perry/RADAR/#T28">T28</a>