Question: Which park is larger of the two, Doñana National Park or Timanfaya National Park?

Passages:
Doñana National Park is a natural reserve in Andalusia, southern Spain, in the provinces of Huelva (most of its territory) and Seville.  It covers 543 km² , of which 135 km² are a protected area.  The park is an area of marshes, shallow streams, and sand dunes in Las Marismas, the delta where the Guadalquivir River flows into the Atlantic Ocean.  It was established as a nature reserve in 1969 when the World Wildlife Fund joined with the Spanish government and purchased a section of marshes to protect it.  The eco-system has been under constant threat by the draining of the marshes, the use of river water to boost agricultural production by irrigating land along the coast, water pollution by upriver mining, and the expansion of tourist facilities.  It is named after wife of the seventh Duke of Medina-Sidonia. Yaiza is a municipality on the island of Lanzarote in the Canary Islands, Spain.  It lies in the southwest of the island and forms part of the province of Las Palmas.  The municipality is bounded by the Atlantic Ocean to the west, south and east.  In the west is the lagoon of Charco Verde.  To the north the Timanfaya National Park is partly within the municipality.  The eastern part of the municipality is mountainous, and south west of the mountains the Rubicon plain stretches to the coast. The Retuertas horse, Spanish: Caballo de las Retuertas or Caballo de las Retuertas de Doñana , is a rare breed of horse indigenous to the Andalusia region of Spain.  It is said to closely resemble the ancient Iberian horses that populated Spain before being domesticated.  It is now found only in the Doñana National Park in the provinces of Huelva and Sevilla, and in The Biological Reserve "Campanarios de Azaba" in Espeja (Salamanca province) a part of which is the research reserve of the Consejo Superior de Investigaciones Científicas, the Spanish National Research Council.  According to a genetic study by the CSIC, the Retuertas horse is one of the oldest European breeds., dating to 3000 years BP, and the only one living in the wild and isolated from other populations. The Marisma de Hinojos is a salt marsh about 50 km north of the city of Cadiz, It is in the province of Huelva, in the autonomous region of Andalusia, Spain.  "Marisma de Hinojos" means "salt marsh of Hinojos", being Hinojos a town which name means "fennel plants".  It lies within Doñana National Park (Parque Nacional de Doñana) on the Costa de la Luz. El Rubicón is a flat gravel plain located at the southernmost end of the island of Lanzarote in the Yaiza municipality.  The plain is to the south of the 'Los Ajaches' range of hills and the lava fields of Timanfaya national park. Sanlúcar de Barrameda (] ), or simply Sanlúcar, is a city in the northwest of Cádiz province, part of the autonomous community of Andalucía in southern Spain.  Sanlúcar is located on the left bank at the mouth of the Guadalquivir River opposite the Doñana National Park, 52 km from the provincial capital Cádiz and 119 km from Sevilla capital of the autonomous region Andalucía.  Its population is 65,805 inhabitants (National Institute of Statistics 2009). The Doñana Disaster, also known as the Aznalcollar Disaster or Guadiamar Disaster (Sp: "Desastre de Aznalcóllar", "Desastre del Guadiamar"), was an industrial accident in Andalusia, southern Spain.  On 25 April 1998, a holding dam burst at the Los Frailes mine, near Aznalcóllar, Seville Province, releasing 4–5 million cubic metres of mine tailings.  The acidic tailings, which contained dangerous levels of several heavy metals, quickly reached the nearby River Agrio, and then its affluent the River Guadiamar, travelling about 40 kilometres along these waterways before they could be stopped.  The Guadiamar is the main water source for the Doñana National Park, a UNESCO World Heritage Site and one of the largest national parks in Europe.  The cleanup operation took three years, at an estimated cost of €240 million. Aznalcázar is a town located in the province of Seville, southern Spain.  It is only 20 minutes away from Seville, and is one of the 13 towns located in Doñana National Park, one of Spain’s most important national parks and wildlife reserves. Mauricio González-Gordon y Díez, Marquis of Bonanza (18 October 1923 – 27 September 2013) was a Spanish sherry maker and a conservationist.  Most of his life he worked for the family company, González Byass, where he increased its exports to a worldwide level.  His family estate was located in the wetland region called Doñana in southern Spain and was threatened by drainage efforts in the early 1950s.  González-Gordon with the help of researchers and international support managed to preserve the site, while at the same time donating some of his family land to the conservation effort.  Afterward, González-Gordon became one of the founders of the Spanish Ornithological Society in 1954.  His conservation efforts for Doñana culminated in the creation of the Doñana National Park in 1969.  The area was designated a UNESCO World Heritage Site in 1994. Timanfaya National Park (Spanish: "Parque Nacional de Timanfaya" ) is a Spanish national park in the southwestern part of the island of Lanzarote, Canary Islands.  It covers parts of the municipalities Tinajo and Yaiza.  The area is 51.07 km2 .  The parkland is entirely made up of volcanic soil.

Supporting sentences:
Doñana National Park is a natural reserve in Andalusia, southern Spain, in the provinces of Huelva (most of its territory) and Seville.  It covers 543 km² , of which 135 km² are a protected area.  The area is 51.07 km2 .