noun
nature conservation area
A legally designated area in Japan for protecting the natural environment, similar to a nature reserve or protected area.
この地域は自然環境保全地域に指定されている。
This area has been designated as a nature conservation area.
自然保護区 is a more general term for a nature reserve or protected area, while 自然環境保全地域 is a specific legal designation under Japanese law.
Compound of 自然 (nature), 環境 (environment), 保全 (conservation), and 地域 (area). A modern legal term.