From Longman Dictionary of Contemporary Englishstate parkˌstate ˈpark noun [countable] DLOa large park owned and managed by a US state, often in an area of natural beauty
Examples from the Corpus
state park• Efforts to convert the railroad into a state park succeeded in 1972.• In fact, reservations for state park campgrounds are already 85 percent booked for the entire summer.• In Episode Two, they pack a tent and sleeping bags a weekend at a nearby state park.• If an animal moves a millimetre out of the state park zones, it's dead. 