Douro, Major river in Castile and León, Spain.
The Douro is a river in Castile and León that flows through northern Spain and Portugal before reaching the Atlantic Ocean. It stretches 897 kilometers from the Sierra de Urbión mountains to the coast, crossing several regions with different landscapes along the way.
Romans called this waterway Durius and built settlements along its banks, developing agriculture and trade routes across the Iberian Peninsula. During medieval times, the course served for centuries as a natural border between Christian kingdoms and Moorish territories.
The name derives from the Latin Durius and likely means "golden river", referring to the mineral-rich sediments that colored the water in earlier centuries. Local fishermen still use traditional nets near the banks, though commercial fishing has declined in recent decades.
Fifteen dams regulate water flow and generate hydroelectric power, while locks enable navigation between Spain and Portugal. The banks are steep and rocky in many places, so access to the water is often possible only through paved paths or boat landings.
The course descends 380 meters within 50 kilometers at the Spanish-Portuguese border, creating several gorges and rapids along the way. These steep sections once forced boatmen to transfer their cargo onto mules and transport goods overland.
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