The Mysore region is an unofficial region that is part of Karnataka state in southern India. It forms approximately the southern half of the non-coastal areas of that state. The area corresponds almost exactly to that of the erstwhile princely state of Mysore. Almost all of that principality, with the exception of a few areas that now lie in neighbouring states, is comprehended by this term.
The region lies on the Deccan plateau, east of the hilly Malenadu region, which includes the eastern foothills of the Western Ghats range. It consists of gently rolling plains, punctuated by several of the large rivers that rise in the Western Ghats and flow eastward to empty into the Bay of Bengal.