cakravāda [alt. cakravāla] (P. cakkavāla; T. 'khor yug ri; C. tiewei), or "ring of mountains," is the proper name of the ring of mountains that surround the world system of the sensuous realm (kāmaloka) within Buddhist cosmology.
The term is also used in a more general sense to refer to any "world system." In Buddhist cosmology, there are an infinity number of world systems with a similar structure. Each world system is the domain of a specific buddha.
See also: buddhakṣetra