The North York Moors (also known as the North Yorkshire Moors) is a national park in North Yorkshire, England. The moors are one of the largest expanses of heather moorland in the United Kingdom. The national park's area is 1,436 km² (554 square miles), and it has a population of about 25,000.The North York Moors became a National Park in 1952, through the National Parks and Access to the Countryside Act of 1949. The North York Moors National Park encompasses two main types of landscape, whose differences are clearly visible, and the coastal belt. There are predominantly green areas of pasture land and the purple and brown heather moorland. The two kinds of scenery are the result of differences in the underlying geology and each supports different wildlife communities. Many visitors to the moors are engaged in outdoor pursuits, particularly walking; the parks has a network of rights-of-way almost 2300 km (1400 miles) in length, and most of the areas of open moorland will be open access under the Countryside and Rights of Way Act 2000. Popular named walks included the Cleveland Way, which circles the moors, and has a section along the coast. The moors have a not changed much in the past 50 years, and are often used as a backdrop to British television programmes and films.The series Heartbeat and the scenes of The Hogsmeade Station in the Harry Potter movies were filmed in Goathland. Dalby Forest is also host to many forms of entertainment throughout the year including outdoor concerts.