A national park is a large area of land which is protected by the government because of its natural beauty, plants, or animals, and which the public can usually visit.
...the Masai Mara game reserve and Amboseli national park.
national park in British English
noun
an area of countryside for public use designated by a national government as being of notable scenic, environmental, or historical importance
National Park in British English
noun
a ski resort in New Zealand, in the central North Island
national park in American English
US
an area of scenic beauty, historical and scientific interest, etc. maintained and preserved by the federal government for the public to visit