Translation guide
The English word 'boundary' can refer to physical borders, abstract limits, or dividing lines. This guide helps learners express these concepts naturally in Japanese.
A line that marks the limits of an area, such as between countries, properties, or regions.
The most common and general word for a boundary line between areas, whether physical or abstract.
この川が県の境界になっている。
This river forms the prefectural boundary.
Often used in everyday speech for a border or boundary, especially between properties or regions. Can also be used figuratively.
うちの庭と隣の庭の境に塀がある。
There is a fence on the boundary between our garden and the neighbor's.
Specifically refers to a national border or frontier.
彼らは国境を越えて隣の国に入った。
They crossed the border into the neighboring country.
Emphasizes the exact line or point where two things meet; can be physical or abstract.
この線が敷地の境目です。
This line is the boundary of the property.
A conceptual line that separates ideas, categories, or states.
Also used for abstract boundaries, such as between concepts or fields.
現実と幻想の境界があいまいだ。
The boundary between reality and fantasy is vague.
Can be used figuratively for a turning point or dividing line in life or events.
Means 'limit' or 'boundary' in the sense of the maximum extent or capacity. Often used for personal limits.
Literally 'a line', used in phrases like 'draw a line' to indicate a clear boundary in behavior or relationships.
The edge of the playing field, or a hit that reaches it.
In baseball, the outfield fence marks the boundary. A hit over it is a home run.
ボールはフェンスを越えた。
The ball went over the boundary fence.
General term for a boundary line, can be used in sports contexts.
Loanword from English, used in cricket and sometimes other sports to mean a boundary hit.
彼はバウンダリーを打った。
He hit a boundary.
境界 (きょうかい) is the most general term for a boundary line, physical or abstract. 境 (さかい) is more colloquial and often used for property lines or figurative turning points. 限界 (げんかい) means 'limit' and is used when referring to the maximum extent of something, like one's ability or patience.
The loanword バウンダリー is only used in specific sports contexts (mainly cricket). For general boundaries, use native Japanese words.
その川が二つの国の境界になっている。
The river marks the boundary between the two countries.
私たちは関係に明確な境界を設ける必要がある。
We need to set clear boundaries in our relationship.
A milestone in life became a major boundary.
体力の限界を感じた。
I felt the boundary of my physical strength.
仕事とプライベートには一線を引いている。
I draw a boundary between work and private life.
If it goes over the court boundary line, it's out.