cultural sphere; cultural area
Refers to a geographical or conceptual region sharing common cultural traits, such as language, customs, or history. Often used in academic or descriptive contexts.
The kanji cultural sphere includes Japan, China, Korea, and others.
This region belongs to the Islamic cultural sphere.
Compound of 文化 (culture) and 圏 (sphere, zone). The word is a straightforward modern coinage reflecting the concept of cultural regions.