The biggest national park in the world is Northeast Greenland National Park
By Karte: NordNordWest, Lizenz: Creative Commons by-sa-3.0 de, CC BY-SA 3.0 de, Link
The area of Northeast Greenland National Park is 972,000 km2. It's bigger than most countries in the world. There are no other national parks in Greenland it was the first to be created by the Kingdom of Denmark, the part of which Greenland is. The park was established on the 21st of May 1974.