Greater Tokyo Metropolitan area, metropolitan area (of a capital)

inside (a region, area, etc.)...

stratosphere

Arctic Circle, the Arctic

sphere, circle, range...

outside (a region, area, etc.)...

sphere of influence

emphasis mark (used in Japanese text in a way similar to underlining)

sphere (e.g. of knowledge, influence)

category theory

cirque, corrie, cwm

atmosphere

great circle

business region, marketing area, commercial sphere...

lithosphere

hydrosphere

thermosphere

hour circle, circle of declination

rhizosphere

polar circle, polar region

tropopause

tile matching the round wind

Soviet bloc

eurozone, euro zone, euro area

lithosphere

co-prosperity sphere

communist bloc, Iron Curtain

Antarctic Circle, the Antarctic

storm zone

biosphere, biome