Douro River: The Heart of Portugal's Wine Country

The Douro River flows approximately 897 kilometres from its source in the Sierra de Urbión in north-central Spain to the Atlantic Ocean at the Portuguese city of Porto. It runs westward across the Iberian Peninsula, forms part of the border between Spain and Portugal, and passes through the celebrated Douro Valley wine region before reaching the sea. It is one of the major rivers of the Iberian Peninsula and drains a basin of around 98,000 square kilometres shared by Spain and Portugal.

Introduction

The Douro — Duero in Spanish — is the third-longest river of the Iberian Peninsula and one of its most historically and economically important. In Spain it crosses the high, dry plateau of Old Castile; in Portugal it descends through a dramatic gorge lined with steep terraced vineyards that have produced port wine for centuries. The lower Douro Valley is a UNESCO World Heritage Site, recognized as one of the oldest demarcated wine regions in the world.

For most of its history the Douro was a wild, rocky, and dangerous river, its rapids making navigation treacherous. In the 20th century a series of large dams tamed the river, drowning the rapids beneath a chain of reservoirs and transforming it into a placid, navigable waterway that today carries both cargo and a thriving river-cruise industry.

Course & Geography

The Douro rises in the Sierra de Urbión in the province of Soria in north-central Spain, at an elevation of around 2,000 metres. It flows generally westward across the Meseta, the high central plateau of Spain, passing the historic Castilian cities of Soria and Zamora and threading through the wine country of Ribera del Duero. In this stretch the river crosses a semi-arid landscape of wheat fields and vineyards.

As it approaches Portugal the river enters a series of deep canyons that form part of the Spanish-Portuguese border, a rugged frontier zone protected on both sides as natural parkland. Once fully inside Portugal, the Douro carves through the mountains of the north in the great gorge that defines the port-wine country before broadening on its final approach to the Atlantic.

The Mouth at Porto

The Douro reaches the sea between the cities of Porto on the north bank and Vila Nova de Gaia on the south. Here the river is spanned by a series of famous bridges, including the double-deck iron Dom Luís I Bridge. Historically the sandbar at the river mouth made the entrance dangerous for shipping, which is one reason Porto's port-wine trade developed as it did.

Length & Key Facts

• Length: ~897 km
• Source: Sierra de Urbión, Soria province, Spain (~2,000 m elevation)
• Mouth: Atlantic Ocean at Porto, Portugal
• Countries: Spain and Portugal
• Basin area: ~98,000 km²
• Border section: The river forms roughly 110 km of the Spain-Portugal frontier
• Major tributaries: Pisuerga, Esla, Tormes, Águeda, Côa, Tâmega

Roughly the first 570 kilometres of the river lie in Spain, with the remainder in Portugal or along the border. The Douro basin is the largest river basin on the Iberian Peninsula by area, and the river's regime is markedly seasonal, with high flows in winter and spring and much lower flows in the hot, dry summers of the interior.

History

The Douro Valley has been inhabited and cultivated since prehistoric times; the Côa Valley, a tributary near the border, contains one of the world's most important collections of Paleolithic open-air rock art, engraved into rocks tens of thousands of years ago and now protected as a UNESCO World Heritage Site. In the Iron Age and Roman periods the valley supported thriving agricultural communities, and viticulture in the region dates back at least two thousand years.

The Douro's modern fame rests on port wine. Fortified wine from the valley became hugely popular in Britain in the late 17th and 18th centuries, especially during periods when war with France interrupted the trade in French wine. In 1756 the Portuguese statesman the Marquis of Pombal established the Douro wine region as a demarcated, regulated appellation — one of the first in the world — to protect its quality and reputation. The wine was shipped down the treacherous river in traditional flat-bottomed boats called barcos rabelos to the lodges of Vila Nova de Gaia for aging and export.

Economy & Human Use

Port Wine and the Terraces

The steep schist slopes of the Douro gorge are carved into thousands of stone-walled terraces that allow vines to grow on gradients too severe for ordinary farming. These vineyards produce the grapes for port, a sweet fortified wine, as well as an increasingly respected range of dry table wines. The dramatic terraced landscape of the Alto Douro was inscribed as a UNESCO World Heritage cultural landscape in 2001 in recognition of its long, continuous winemaking tradition.

Dams and Power

During the 20th century engineers built a cascade of dams along both the Spanish and Portuguese sections of the river for hydroelectric power and to make the river navigable. In Portugal a series of dams with large navigation locks converted the once-impassable rapids into a stepped chain of reservoirs. These installations generate significant hydroelectricity and have made the river fully navigable from Porto up to the Spanish border.

Tourism and Navigation

Today the calm, dammed Douro supports a booming river-cruise industry. Boats carry visitors up the scenic gorge from Porto through the wine country, and a historic railway line hugging the riverbank offers one of Europe's most beautiful train journeys. Tourism, alongside wine, has become a mainstay of the regional economy.

Cities Along the River

• Soria: A historic Castilian city near the river's upper course in Spain.
• Zamora: A Spanish city rich in Romanesque architecture on the middle Douro.
• Peso da Régua: The traditional commercial heart of the Portuguese port-wine trade.
• Pinhão: A small town at the centre of the finest port vineyards, known for its tiled railway station.
• Porto: Portugal's second city, at the river's mouth, from which port wine takes its name.

Ecology

The steep, rocky canyons of the Douro, particularly along the Spanish-Portuguese border, shelter important populations of birds of prey, including griffon vultures, Egyptian vultures, and golden eagles, and both countries have created natural parks to protect this wild frontier landscape. The damming of the river has changed its ecology substantially, converting free-flowing rapids into a series of slack-water reservoirs and altering conditions for native fish, while also creating new habitat along the reservoir margins. Efforts continue to balance power generation, agriculture, and conservation along this heavily used river.

Good to Know

How long is the Douro River?

The Douro is about 897 kilometres long, running from the mountains of north-central Spain to the Atlantic at Porto.

Which countries does the Douro flow through?

It flows through Spain and Portugal, and for a stretch of roughly 110 kilometres it forms the border between the two countries.

Why is the Douro Valley famous?

The Douro Valley is the home of port wine and one of the oldest demarcated wine regions in the world; its terraced vineyard landscape is a UNESCO World Heritage Site.