The Catville region is the basic and original underground refuge for runaway/strey cats. Eventurally, Catville expanded in a matter of copying the world exactly the way it is today, except for the original region of Catville just outside of New York City. Catville is refered to the underground world from an outsider's point of view, and insiders refer to it as "the world".

The Catville Region is home to lots of Streets containing Various Characters from the Tuckermeows© series. The well known street is 'Redknob Drive and Brooksville'.