Vidago is a village and a former-civil parish in the municipality of Chaves, in the Portuguese district of Vila Real.

Finally in 1907 the railroad between Régua and Vila Real was extended to Pedras Salgadas, 12 kilometres (7.5 mi) to the south of Vidago.

The fame of the curative powers of the waters spread so far that from 1876 to 1889 they were awarded prizes in Madrid, Paris, Vienna and Rio de Janeiro.

For this, Vidago was once one of the most visited Portuguese spas; the water is apparently effective in the treatment of digestive problems, as it contains sodium bicarbonate and, according to publicity leaflets, radioactive elements.

When the Palace Hotel was built in 1910, it was one of the most luxurious on the Iberian Peninsula, that included concerts, tennis and croquet courts, and, on the small island within the lake, there was a spacious skating rink.