A man and a tree
A man and a tree at Northumberland National Park. Northumberland National Park is the northernmost national park in England. It covers an area of more than 1,030 square kilometers (400 sq mi) between the Scottish border in the north to just south of Hadrian's Wall, and it is one of the least populated and least visited of the National Parks. The park lies entirely within Northumberland, covering about a quarter of the county.