noun
sanctuary; nature reserve; protected area
A designated area where wildlife, natural habitats, or cultural resources are legally protected. Often used in official names and conservation contexts.
See also: 鳥獣保護区域
この島全体が鳥獣保護区に指定されている。
This entire island is designated as a wildlife sanctuary.
国立公園内にはいくつかの自然保護区がある。
There are several nature reserves within the national park.
Emphasizes nature conservation; 保護区 can also include cultural or historical protected areas.
Compound of 保護 (protection) + 区 (area, zone). The term follows standard Sino-Japanese word formation and has no irregular historical derivation.