領分|りょうぶんryoubun[1]atamadaka (head-high)

1. nounterritory; domain; dominion; possession; sphere of action
   それは私の領分りょうぶんですよ。↗

   That's my province.

• Synonym領域りょういきNeutralThe modern, neutral everyday word for a field of study or a territory, as in 「専門領域」; 「領分」 is old-fashioned written prose leaning to turf and one's proper place.
• Synonym勢力圏せいりょくけんWrittenWritten term for the area within a state's or group's political reach; about power over a region, not personal turf or duty.
• SynonymフィールドCasualColloquial loanword for a field of research or work, or the outdoors; casual, with none of 「領分」's old-fashioned sense of one's own turf.
• Synonym分野ぶんやNeutralThe everyday word for branches of learning, the arts, professions; classifies fields and never carries 「領分」's sense of territory or duty.
• Synonym境域きょういきWrittenWritten and rare; covers the boundaries of a piece of land, or a domain or field as such, without 「領分」's sense of one's own turf or duty.
• Synonym勢力範囲せいりょくはんいNeutralSame meaning as 「勢力圏」 — the area a state, group or person holds sway over — but slightly less stiff; still mostly a written-prose word.
• Synonym影響圏えいきょうけんWrittenWritten term for the area a state or person's influence reaches; centres on reach of influence rather than possession or one's proper bounds.
• Related活動範囲かつどうはんいNeutralThe range within which a person can act or work; objective and descriptive, with no sense of one's own turf or proper bounds as in 「領分」.
• Related活動の領域NeutralA neutral phrase for the sphere in which activity is carried on; describes scope of action without the possessive, old-fashioned tone of 「領分」.

Use 「領分」 for one's own territory or proper sphere of duty, as in 「他人の領分を侵す」; it is old-fashioned written prose. For fields of study or work pick 「分野」 or 「領域」. For a state's or group's sphere of influence use 「勢力圏」 (or 「勢力範囲」/「影響圏」). 「活動範囲」 and 「活動の領域」 describe the range of activity, and 「フィールド」 is a casual loanword for a research field or the outdoors.

Usage comparisons are AI-assisted and cross-checked by multiple models; for study reference only

1. 領有りょうゆうしている土地とち。
2. 勢力せいりょくの及およぶ範囲はんい。