It is believed that the Benedictine monks of the Carboerio Monastery already used the minero-medicinal waters from A Brea. In the parish of Merza there was a small facility, visited by more than 400 people a year, which became popular in the 19th century. In fact, it was mentioned by the doctor Nicolás Taboada Leal, who talked about their importance but also about the fact that it was not used to the full. A century later, in 1994, the spa was built and its waters were declared of public interest. This town is surrounded by amazing landscapes watered by the Ulla and Deza rivers, but the most outstanding setting is the cascade of the Toxa River, very close to the spa.