Kantō area; Kantō region
Refers to the greater Tokyo metropolitan area and surrounding prefectures; often used in contexts like commuting, broadcasting, or economic zones.
See also: 関東
I want to go to a university in the Kantō area.
This TV station can only be watched in the Kantō region.
Compound of 関東 (Kantō) and 圏 (sphere/area). The term 関東 dates back to ancient administrative divisions, while 圏 adds the nuance of a defined zone or catchment area.