Cthulu Regio is located on Pluto.
<a href="//commons.wikimedia.org/wiki/User:PlanetUser" title="User:PlanetUser">PlanetUser</a> (image courtesy of NASA/JHUAPL/SwRI)
2015-07-14
<a href="//commons.wikimedia.org/wiki/File:Global_LORRI_mosaic_of_Pluto_in_true_colour.jpg" title="File:Global LORRI mosaic of Pluto in true colour.jpg">File:Global LORRI mosaic of Pluto in true colour.jpg</a>