Question: Which national park, Picos de Europa National Park or Ordesa y Monte Perdido National Park, is found in Northern Spain?

Context paragraphs:
Lakes of Covadonga: The Lakes of Covadonga (el.  1134 m.) are composed of two glacial lakes located on the region of Asturias, Spain.  These lakes, often also called Lakes of Enol or simply Los Lagos, are Lake Enol and Lake Ercina located in the Picos de Europa range and they are the original center of the Picos de Europa National Park, created in 1918.

Lake Enol: Lake Enol is a small highland lake in the Principality of Asturias, Spain.  It is located in the Picos de Europa Western Massif, Cantabrian Mountains.  It is next to Lake Ercina and together, they form the group known as Lakes of Covadonga, inside the Picos de Europa National Park.  Lake Enol is the larger of the two.  It is situated approximately 10 km from Covadonga and 25 km from Cangas de Onís.  A curving road is available from Arriondas to the lake.  Measuring 0.1 km2 , it is one of the biggest lakes in the area.  Lake Enol is situated 1070 m above sea level, in the Picos de Europa).  It was formed by the withdrawal of a front glacier.

Tobes: Tobes is one of eight parishes (administrative divisions) in Peñamellera Baja, a municipality within the province and autonomous community of Asturias, in northern Spain.  It is located in the Picos de Europa National Park.

Lake Ercina: Lake Ercina is a small highland lake in Asturias, Spain.  It is located in the Picos de Europa, in the Cantabrian Mountains.  Situated next to Lake Enol, together, they forms the group known as Lakes of Covadonga within the Picos de Europa National Park.  Lake Ercina is smaller than Lake Enol.  It is situated at an altitude of 1108 m and its maximum depth is just over 2 m .  The eutrophic lake, covers approximately eight hectares.  Its characteristics are tied to its glacier origin and geographic location.

Naranjo de Bulnes: The Naranjo de Bulnes (known as Picu Urriellu in Asturian) is a limestone peak dating from the paleozoic era, located in the Macizo Central region of the Picos de Europa, Asturias (Spain).  Its name "Picu Urriellu" is believed to be derived from the term "Los Urrieles" which is used to describe the Macizo Central.  Naranjo de Bulnes is part of the Cabrales region of Asturias, and lies within the Picos de Europa National Park.

Ordesa y Monte Perdido National Park: Ordesa y Monte Perdido National Park (Parque nacional de Ordesa y Monte Perdido) is an IUCN Category II National Park situated in the Pyrenees of Huesca province, Aragon, Spain.  There has been a National Park in the Ordesa Valley since 1918.  Its protected area was enlarged in 1982 to cover the whole region amounting to 156.08 km².

Monte Perdido: Monte Perdido (in Spanish; Mont Perdu in French; Mont Perdito in Aragonese; Mont Perdut in Catalan, all four meaning "lost mountain") is the third highest mountain in the Pyrenees.  The summit of Monte Perdido (3355 m), located in Spain, lies hidden from France by the seemingly impenetrable peaks of the Cirques of Gavarnie and Estaubé.  It stands in the north of Huesca province.  The mountain forms part of the Monte Perdido Range and is located in the Ordesa y Monte Perdido National Park, in the western part of the Pyrenees, in the community of Aragon, Spain.

Trescares: Trescares is one of eight parishes (administrative divisions) in Peñamellera Alta, a municipality within the province and autonomous community of Asturias, in northern Spain.  It is located in the Picos de Europa National Park.

Oceño: Oceño is one of eight parishes (administrative divisions) in Peñamellera Alta, a municipality within the province and autonomous community of Asturias, in northern Spain.  It is located in the Picos de Europa National Park.

Picos de Europa National Park: The Picos de Europa National Park (Spanish: "Parque Nacional de Picos de Europa" ) is a National Park in the Picos de Europa mountain range, in northern Spain.  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.

Supporting paragraphs: Picos de Europa National Park Ordesa y Monte Perdido National Park
Answer: Picos de Europa National Park