noun
red zone
Loanword from English; used in contexts such as sports, safety, or risk to indicate a dangerous or critical area.
その地域は火山のレッドゾーンに指定されている。
That area is designated as a volcanic red zone.
試合終盤、チームはレッドゾーンで必死の守備を見せた。
In the closing minutes, the team showed desperate defense in the red zone.