Meaning
圏 means sphere, zone, area, or range — an enclosed region where specific conditions apply or certain forces hold sway. Whether the context is geographic, political, cultural, or scientific, the kanji implies a bounded space with a clear interior and exterior.
Structurally, 圏 is built around the 囗 radical (くにがまえ), a square enclosure representing a bordered area — the same shorthand a cartographer uses when drawing a boundary on a map. The internal components reinforce the sense of something organized and contained within those borders.
圏 turns up constantly in formal, academic, and journalistic Japanese. It is essential for compound nouns describing political or cultural groupings (勢力圏, 文化圏), geographic regions (北極圏, 首都圏), and scientific terminology (大気圏, 電離圏). Enclosure and defined scope run through every use.
圏 has 13 strokes and is a secondary school (中学) level Joyo kanji — absent from elementary curricula, but indispensable for newspapers, academic texts, and geographic writing. Anyone who has lost mobile signal in Japan has already seen it: your phone screen flashes 圏外.
Readings
On'yomi (音読み) — Chinese-derived readings
圏 has one on'yomi: ケン. Derived from Middle Chinese phonology, it applies to every compound — geographic zones, cultural spheres, atmospheric layers, mobile signal range — without exception. No kun'yomi exists, so ケン covers the kanji's entire usage in modern Japanese.
ケン — Used in all compounds to denote a defined zone, sphere, or area:
- 圏内 (ken-nai) — within range, inside the designated area
- 圏外 (ken-gai) — out of range, outside the area; the message displayed on Japanese smartphones when there is no signal
- 首都圏 (shuto-ken) — the Greater Tokyo Metropolitan Area
- 大気圏 (taiki-ken) — the atmosphere, the layer of air surrounding Earth
- 北極圏 (hokkyoku-ken) — the Arctic Circle
Kun'yomi (訓読み) — Native Japanese readings
圏 has no kun'yomi. Unlike most kanji that double as standalone Japanese words, it exists only inside Chinese-derived compound nouns — always paired with at least one other kanji. Good news for learners: master the compounds below, and you've mastered the kanji.
Common Words & Compounds
圏 only works in combination — but those combinations span an impressive range. The compounds below are grouped by theme and cover what comes up most in real-world reading at N1 level.
Geographic & Polar Zones
- 首都圏 (shuto-ken) — Greater Tokyo Metropolitan Area; the most common everyday compound using 圏, appearing constantly in news, transport announcements, and real estate listings
- 北極圏 (hokkyoku-ken) — the Arctic Circle
- 南極圏 (nankyoku-ken) — the Antarctic Circle
- 都市圏 (toshi-ken) — urban area, metropolitan zone
- 熱帯圏 (nettai-ken) — tropical zone; the equatorial belt of Earth
Political & Economic Spheres
- 勢力圏 (seiryoku-ken) — sphere of influence; a zone of political or military power projection
- 経済圏 (keizai-ken) — economic zone; a region defined by shared economic activity
- 商圏 (shō-ken) — commercial catchment zone; the area from which a business draws its customers
Cultural & Linguistic Spheres
- 文化圏 (bunka-ken) — cultural sphere; a region defined by shared cultural heritage or traditions
- 言語圏 (gengo-ken) — linguistic sphere; a zone where a particular language is dominant
- 生活圏 (seikatsu-ken) — living area; the geographic zone covering one's daily routines
Scientific & Atmospheric Layers
- 大気圏 (taiki-ken) — atmosphere; Earth's atmospheric envelope
- 電離圏 (denri-ken) — ionosphere; the ionized upper atmospheric layer that reflects radio waves
Range Markers
- 圏内 (ken-nai) — within range, inside the zone
- 圏外 (ken-gai) — out of range, outside the zone; seen daily on Japanese smartphones with no signal
Example Sentences
圏外に入って、スマホの電波が届かなくなった。
Ken-gai ni haitte, sumaho no denpa ga todokanaku natta.
I went into a dead zone and my smartphone lost signal.
首都圏では電車が非常に便利だ。
Shuto-ken de wa densha ga hijō ni benri da.
In the Greater Tokyo Area, trains are extremely convenient.
大気圏は地球を包んでいる空気の層だ。
Taiki-ken wa chikyū wo tsutsunde iru kūki no sō da.
The atmosphere is the layer of air that envelops the Earth.
その国はまだ先進国の勢力圏内にある。
Sono kuni wa mada senshinkoku no seiryoku-ken-nai ni aru.
That country is still within the sphere of influence of developed nations.
日本、中国、韓国は漢字文化圏に属する。
Nihon, Chūgoku, Kankoku wa kanji-bunka-ken ni zoku suru.
Japan, China, and Korea all belong to the kanji cultural sphere.
この店の商圏は半径５キロ以内だ。
Kono mise no shōken wa hankei go-kiro inai da.
This store's commercial catchment zone extends within a 5-kilometer radius.
北極圏では夏に白夜が続く。
Hokkyoku-ken de wa natsu ni hakuya ga tsuzuku.
In the Arctic Circle, the midnight sun lasts through summer.
その地域は経済圏として急速に発展している。
Sono chīki wa keizai-ken to shite kyūsoku ni hatten shite iru.
That region is rapidly developing as an economic zone.
彼の生活圏は駅の周辺に集中している。
Kare no seikatsu-ken wa eki no shūhen ni shūchū shite iru.
His daily life revolves around the area near the train station.
Memory Tip
Picture 圏 as a bold circle drawn around a territory on a map. The outer component 囗 is literally a square border — the same boundary a cartographer draws when marking off a zone. The interior strokes represent the activity happening inside that enclosed space.
Start with the pair 圏内 (ken-nai) — inside the zone — and 圏外 (ken-gai) — outside the zone. You'll see 圏外 every time your smartphone loses signal: in the mountains, on a rural train, in a basement. Hard to forget. Once those two click, every other 圏 compound falls into place.