Northumberland National Park is the northernmost national park in England. It covers an area of more than 1030 square kilometers between the Scottish Border in the north to just south of Hadrian's Wall. The park lies entirely within Northumberland, covering about a quarter of the county.

The park covers several distinct areas. In the North are the Cheviots, a range of hills that mark the border between England and Scotland. Further south, the hills give way to areas of rolling moorland, some of which have been covered by forestry plantations to form Kielder Forest. The southernmost part of the park covers the dramatic central section of Hadrian’s Wall.

There many archaeological sites, ranging from prehistoric monuments and Roman remains to Pele towers, constructed as a defence against Border Reivers.

The Park's official symbol is the Curlew