Which park, Picos de Europa National Park or Caldera de Taburiente National Park is on an island?
Picos de Europa National Park:  It is within the boundaries of three autonomous communities, Asturias, Cantabria and Castile and León, which are represented on the body which runs the park. Caldera de Taburiente National Park: 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.
i don't know