no-trespassing area; restricted zone; no-go area
A clearly defined area where entry is prohibited, often marked by signs. Used in official, legal, and everyday contexts.
Beyond this point is a restricted area.
The area around the construction site is a no-entry zone.
A shorter phrase meaning 'no entry' or 'keep out', often used on signs. 立ち入り禁止区域 is a full noun phrase specifying the area itself.
Standard kanji spelling with okurigana.
Common abbreviated spelling without okurigana, often seen on signs.
Compound of 立ち入り (entry) + 禁止 (prohibition) + 区域 (area). A straightforward modern term.