national park       
noun [ C ] uk/ˌnæʃ.ən.əl ˈpɑːk/ us/ˌnæʃ.ən.əl ˈpɑːrk/
 国家公园
an area of a country that is protected by the government because of its natural beauty or because it has a special history
  Kenya has 40 national parks and game reserves supporting a wide range of unique habitats.
 Yellowstone was the first national park in the US.
 They live in the Lake District national park.
 - More examples
 - The pass allows unlimited access to all federal national parks for a year.
 - Out towards Italy, there are several uninhabited islands with national park status.
 - Even farther south along the Dead Sea you come to Masada, now a national park.