The Río Ebro is the longest river in Spain, stretching approximately 910 kilometers. It originates in the Cantabrian Mountains and flows eastward, emptying into the Mediterranean Sea near the city of Tortosa. The river passes through several regions, including La Rioja, Navarre, and Catalonia, and is known for its rich biodiversity and historical significance. The Ebro basin is vital for agriculture, providing irrigation to many fertile areas. It also supports various ecosystems and wildlife. The river has been a crucial waterway since ancient times, influencing the development of cities like Zaragoza and Logroño along its banks.