Río Eo, Oscos y Terras de Buron Biosphere Reserve

The Río Eo, Oscos y Terras de Burón Biosphere Reserve is one of the wildest and most biologically varied corners of northern Spain, a stretch of protected countryside straddling the border between Asturias and Galicia. Santa Eulalia de Oscos sits right at its heart, in the district locally known as "Oscos," far removed from the coastal resorts and well-trodden tourist routes of the region.

What makes this reserve unique?

UNESCO designated the area as a Biosphere Reserve in June 2007, making it the first in Spain to be shared jointly by two autonomous communities — Asturias and Galicia. Altogether the protected land covers almost 160,000 hectares spread across fourteen municipal districts: seven on the Galician side, including Ribadeo, A Fonsagrada and Negueira de Muñiz, and seven on the Asturian side, among them Santa Eulalia de Oscos itself.

What does the landscape look like?

The reserve takes its name from the River Eo, the most extensive waterway within its boundaries, though the terrain is also shaped by the Navia, Porcía and Miño rivers. The land is markedly mountainous: its highest point is Pico Busbeirón, rising to 1,286 metres, part of a range of hills that approaches the main axis of the Cantabrian Mountains. It is this rugged relief — steep valleys, gorges and forested slopes — that gives the Oscos district its remote, almost forgotten character.

What natural features can be found here?

The reserve's biological wealth spans the Eo estuary, large parts of the Navia, Porcía and Miño river basins, and coastal catchments draining directly into the Cantabrian Sea. Laurel and willow forests survive along the sea cliffs, oak woodlands cover the coastal hills and mountainsides, and lush riverside woodland thick with holly and oak lines the watercourses. This mosaic of habitats has made the area popular with birdwatchers and nature travellers looking for lesser-known corners of Spain.

How do people live in this region?

According to 2005 figures, close to 33,000 people lived within the reserve's boundaries. The local economy has long rested on traditional livestock farming, agriculture and, historically, an iron industry — traces of old forges and water mills can still be found scattered through the surrounding villages. In recent decades fishing has grown into a major source of income, particularly salmon and shellfish harvested along the coast and in the Eo estuary.

Why visit Santa Eulalia de Oscos?

Santa Eulalia de Oscos serves as a gateway into one of Spain's most authentic rural landscapes, where stone houses, water mills and narrow river valleys remain largely untouched by mass tourism. It suits travellers who value quiet, hiking through oak and laurel forest, and a genuine encounter with the traditional rural life of northern Spain.

Frequently asked questions

When was the reserve recognised by UNESCO? In June 2007.

How large is the protected area? Almost 160,000 hectares across fourteen municipal districts in Asturias and Galicia.

What is the highest peak in the reserve? Pico Busbeirón, at 1,286 metres.

What do local residents do for a living? Traditional livestock farming, agriculture, historically ironworking, and today also coastal fishing.