Portomarín is a municipality in the provinceLugo, in the autonomous community ofGalicia,Spain. It belongs to thecomarca ofLugo. The town has a population of 1345 (Spanish 2023 Census) and an area of 115 km². It is one of the towns in the pilgrimage route known as theFrench Way, part of theCamino de Santiago.
The town of Portomarín was built next to a Roman bridge over theMiño River and rebuilt during the Middle Ages.
In the 1960s theMiño River was dammed to create theBelesar reservoir, putting the old village of Portomarín under water. The most historic buildings of the town were moved brick by brick and reconstructed in the new town, including its castle-style main church:Church of San Juan of Portomarín.
In the seasons when the dam is at low level, the remains of ancient buildings, the waterfront and the old bridge are still visible.