Doñana National Park is located in Andalusia, in the provinces of Huelva and Seville, and covers 543 km²(337.41 mi²), of which 135 km²(83.89 mi²) are a protected area. The park is an area of marsh, shallow streams, and sand dunes in Las Marismas, the Guadalquivir River Delta region where it flows into the Atlantic Ocean. The original area was established in 1963 when the World Wildlife Fund joined with the Spanish government and purchased a section of marshes to protect it. There has been a constant threat to the eco-system, that of drainage of the marshes, the use of river water to boost agricultural production by irrigating land along the coast, and the expansion of tourist facilities.

In 2011, an archeological team proposed that the lost city of Atlantis was once located in what are now the swamps of the Doñana National Park having been destroyed by a tsunami.

In 1989 the surroundings of the national park were given more protection when a buffer zone was declared a natural park under the management of the regional government. The two parks, national and natural, have since been classified as a single natural landscape.

A national park is a reserve of natural, semi-natural, or developed land that a sovereign state declares or owns. Although individual nations designate their own national parks differently (for example, see Martin Luther King, Jr. Memorial in the United States), an international organization, the International Union for Conservation of Nature (IUCN), and its World Commission on Protected Areas, has defined National Parks as its category II type of protected areas. While ideas for this type of national park had been suggested previously, the United States established the first such one, Yellowstone National Park, in 1872. The largest national park in the world meeting the IUCN definition is the Northeast Greenland National Park, which was established in 1974. According to the IUCN, there were 6,555 national parks worldwide in 2006 that meet its criteria.

In 1969 the IUCN (International Union for the Conservation of Nature and Natural Resources) declared a national park to be a relatively large area with particular defining characteristics. A national park was deemed to be a place