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Hydrography

Galicia is poetically known as the "country of the thousand rivers " ("o país dos mil ríos"). The largest and most important of these rivers is the Miño, poetically known as O Pai Miño (Father Miño), which is 307.5 km (191.1 mi) long and discharges 419 m (548 cu yd) per second, with its affluent the Sil, which has created a spectacular canyon. Most of the rivers in the inland are tributaries of this river system, which drains some 17,027 km (6,574 sq mi). Other rivers run directly into the Atlantic Ocean or the Cantabrian Sea, most of them having short courses. Only the Navia, Ulla, Tambre, and Limia have courses longer than 100 km (62 mi).

Galicia's many hydroelectric dams take advantage of the steep, deep, narrow rivers and their canyons. Due to their steep course, few of Galicia's rivers are navigable, other than the lower portion of the Miño and the portions of various rivers that have been dammed into reservoirs. Some rivers are navigable by small boats in their lower reaches: this is taken great advantage of in several semi-aquatic festivals and pilgrimages.