Greenland

The island is home to the world's largest and northernmost national park.

An excerpt from the article 23 facts about Greenland

It was established in 1974 and covers an area of 972,000 km2 (375,291 sq mi). It has been a UNESCO Biosphere Reserve since 1977. The park is home to between 5,000 and 15,000 muskoxen and polar bears. Scientific activities are carried out in small research facilities.