区域|くいきkuiki[1]atamadaka (head-high)

1. nounarea; zone; district; quarter; section; limits; boundary
   駐車禁止ちゅうしゃきんし区域くいきに車くるまを止とめてはいけません。↗

   You must not park your car in a no parking zone.

• SynonymエリアNeutralLoanword for an area or range, common in everyday speech; 「区域」 leans toward areas designated by law or administration.
• Synonym地域ちいきNeutralAn area whose parts share features of terrain, economy, or culture, as in 「地域社会」.
• Synonym地区ちくNeutralAn area divided off by administration or use, as in 「住宅地区」; a planning term.
• SynonymゾーンNeutralLoanword for an area set aside for a particular use, as in 「禁煙ゾーン」.
• Synonym領域りょういきNeutralCovers territory or an academic field, including abstract spheres; 「区域」 mostly refers to concrete plots of land.
• Synonym一帯いったいNeutralA whole stretch covering a place and its surroundings, as in 「この辺一帯」; the extent is vague.
• Synonym地帯ちたいNeutralAn area marked by a shared feature, as in 「工業地帯」 or 「安全地帯」.
• Synonym区画くかくNeutralA divided-off section or plot, as in 「区画整理」; the focus is on the dividing lines.
• SynonymリージョンNeutralLoanword for a large region, used mostly in cloud services and games.

Use 「区域」 for areas designated by law or regulation, as in 「立入禁止区域」. In casual speech, 「エリア」 is the natural choice. For areas united by terrain, economy, or culture, pick 「地域」 or 「地帯」; for a whole surrounding stretch, 「一帯」. 「地区」 suits administratively zoned districts and 「ゾーン」 purpose-specific zones; 「領域」 covers abstract domains and 「区画」 divided plots.

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

1. 限かぎられた範囲はんい。
2. 行政ぎょうせい区画くかく。