首都圏【しゅとけん】
Greater Tokyo Metropolitan area, metropolitan area (of a capital)
圏内【けんない】
(being) within range (radio, commuting, etc.), (being) within the sphere (e.g. of influence)
北極圏【ほっきょくけん】
Arctic Circle, the Arctic
圏外【けんがい】
(being) out of range (e.g. mobile network, radar, missiles), (being) out of contention, (being) beyond influence