thevizir

Usually, yes, the kithkin are an extraterrestrial, alien race, and Cirundi is another planet unrelated to Earth; though I did use a map of Carboniferous Earth as a base for the map before tweaking it (and I will probably continue tweaking the world until it reaches the point that I'm happy with it). 

Now, this is not always true, as in my current Pathfinder game, Cirundi is a continent on the planet that was sunk beneath the waves, and thus the kithkin are not extraterrestrial, but merely not from the Lands of Mists, not unlike the kitsune, catfolk, vanara, or wayang. It all depends on what kind of story I want to use them in at the moment!