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.
Echium gentianoides is a synonym of "Echium thyrsiflorum" , a flowering plant in the borage family Boraginaceae with brilliant blue tubular flowers.
 It is endemic to the island of La Palma, the Canary Islands.
 It occurs in one location of La Caldera de Taburiente where it grows in sunny, rocky sites at altitudes higher than 1.800 m.
 The main threat described for this species is predation by goats.
Echium wildpretii" subsp.
 "trichosiphon is an "Echium" that is found high up in the area of La Caldera de Taburiente on the Canary Island of La Palma.
 Like its sister plant on Tenerife, this plant forms a large rosette of silvery leaves which eventually give rise to tall spikes of bright pink flowers.
 The plant is biennial and dies after flowering.
 This plant can be grown in gardens, but requires good drainage and fairly mild conditions.
 The plant hates water falling in the centre of the rosette and will often rot in such conditions.
Idafe Rock is a natural stone pillar located in Caldera de Taburiente National Park on the island of La Palma in the Canary Islands.
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.
Barlovento (Spanish for windward) is a municipality in the northern part of the island of La Palma, one of the Canary Islands, and a part of the province of Santa Cruz de Tenerife.
 Barlovento is on the main highway which encircles the island.
 The land rises steeply from a small coastal plain, to the rim of the Caldera de Taburiente at Pico de la Cruz (2,350m)
Caldera de Taburiente National Park (Spanish: "Parque Nacional de la Caldera de Taburiente" ) is large geological feature on the island of La Palma, Canary Islands, Spain.
 It contains the enormous expanse of the Caldera de Taburiente which dominates the northern part of the island, and was designated as a national park in 1954.
 The telescopes of the Roque de los Muchachos Observatory are situated very close to the summit.
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.
Roque de los Muchachos (English: "Rock of the Boys") is a rocky mound at the highest point on the island of La Palma in the Canary Islands, Spain.
 The rocks are found at an elevation of 2,423 m above sea level, not far from the Observatorio del Roque de los Muchachos, where some of the world's largest telescopes are situated; the altitude and the dryness of the climate here give rise to excellent observing conditions.
 The rocks are contained with the Parque Nacional de la Caldera de Taburiente.
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.

Question: What country does the Doñana National Park and Caldera de Taburiente National Park have in common?
Answer: Spain