A tract of land declared by the national government to be public property WordNet 3.0 & Open English WordNet

A national park is a natural park in use for conservation purposes, created and protected by national governments. Wikipedia

Reserve of land. Wikipedia Disambiguation

A reserve of land protected from most human development and pollution Wikipedia Disambiguation

Park used for conservation purposes of animal life and plants Wikidata

Areas of outstanding natural beauty, set aside for the conservation of flora, fauna and scenery, and for recreation, if this does not conflict with the conservation objectives of the parks and their landscapes. Hunting, logging, mining, commercial fishing, agriculture and livestock grazing are all controlled within national parks, as is industrial activity. OmegaWiki

An area of land that is not built upon, but reserved by the national government for recreational use. Wiktionary

National park. Wiktionary (translation)