thumb|upright|An elephant safari through the Jaldapara Wildlife Sanctuary in West Bengal, India A national park is a reserve of land, usually declared and owned by a national government, protected from most human development and pollution. National parks are protected areas of IUCN category II. The largest national park in the world is the Northeast Greenland National Park, which was established in 1974. According to The World Conservation Union IUCN, there are now 6,555 national parks worldwide (2006 figure).

History

In 1810, the English poet William Wordsworth described the Lake District as a "sort of national property in which every man has a right and interest who has an eye to perceive and a heart to enjoy". The painter George Catlin, in his travels through the American West, wrote in 1832 that the Native Americans in the United States might be preserved "by some great protecting policy of government . . . in a magnificent park . . . A nation's park, containing man and beast, in all the wild and freshness of their nature's beauty!" Similar ideas were expressed in other countries—in Sweden, for instance, the Finnish-born Baron Adolf Erik Nordenskiöld made such a proposition in 1880. The Scottish-American naturalist John Muir was inspirational in the foundation of national parks, anticipating many ideas of conservationism, environmentalism, and the animal rights movement.

The first effort by any government to set aside such protected lands was in the United States, on April 20, 1832, when President Andrew Jackson signed legislation to set aside four sections of land around what is now Hot Springs, Arkansas to protect the natural, thermal springs and adjoining mountainsides for the future disposal of the US government. It was known as the Hot Springs Reservation. However no legal authority was established and federal control of the area was not clearly established until 1877.

The next effort by any government to set aside such protected lands was, again, in the United States, when President Abraham Lincoln signed an Act of Congress on June 30, 1864, ceding the Yosemite Valley and the Mariposa Grove of Giant Sequoias (later becoming the Yosemite National Park) to the state of California:

Cquote: — U.S. Congress, 1864

In 1872, Yellowstone National Park was established as arguably the world's first truly national park. When news of the natural wonders of the Yellowstone were first promulgated, the land was part of a federally governed territory. Unlike Yosemite, there was no state government that could assume stewardship of the land, so the federal government took on direct responsibility for the park, a process formally completed in October 1, 1890—the official first National park of the United States. It took the combined effort and interest of conservationists, politicians and especially businesses—namely, the Northern Pacific Railroad, whose route through Montana would greatly benefit by the creation of this new tourist attraction—to ensure the passage of that landmark enabling legislation by the United States Congress to create Yellowstone National Park. Theodore Roosevelt, already an active campaigner and so influential as good stump speakers were highly necessary in the pre-telecommunications era, was highly influential in convincing fellow Republicans and big business to back the bill.