noun
national garden; national park (urban)
Refers to a specific category of public parks in Japan managed by the national government, such as Shinjuku Gyoen or the Imperial Palace Outer Garden. Not a general term for any national park; for large natural national parks, 国立公園 is used.
新宿御苑は国民公園の一つです。
Shinjuku Gyoen is one of the national gardens.
国民公園は環
National gardens are managed by the Ministry of the Environment.