It is located in Peneda-Gerês National Park, in the municipality Montalegre, in Vila Real District, Portugal.

Its crest altitude is 880 m. The volume of the dam is 1,117,000 m³.

[1] At full reservoir level of 880 m (maximum flood level of 880.1 m) the reservoir of the dam has a surface area of 22.12 km² and its total capacity is 568.69 mio.

[4] The pumped-storage hydroelectric power plant went operational in 1964.

The power station is located downstream and contains 2 reversible Francis turbine-generators with 36.75 MW (45 MVA), each in an underground powerhouse.