圏 - sphere, circle, radius

Arctic Circle; the Arctic

Greater Tokyo Metropolitan area

stratosphere

inside (a region, area, etc.); within the range (of); within the sphere (of influence, etc.)

outside (a region, area, etc.); out of range (of a mobile network, radar, etc.); outside the sphere (of influence, etc.); out of contention; out of reach

safety zone; buffer (e.g. against defeat)

Soviet bloc

former Soviet bloc

member states of the former Soviet bloc

biosphere reserve (UNESCO)

lithosphere

countries where Chinese characters are used or were historically used