Loaded with major ions — the essential minerals (Ca, Mg).
Buoyancy
Standard buoyancy
LowHigh
Soft water — natural, classic buoyancy.
BicarbonatesSodiumCalcium
Balneario de Sobrón in the Ebro gorge on the border of Álava and Burgos provinces is a secluded thermal retreat in one of the most dramatic river landscapes of northern Spain. The bicarbonate mineral springs here, frequented since Roman times, emerge near the shores of the Sobrón reservoir within a steep limestone gorge where the young Ebro river has carved through the Cantabrian mountains. The historic balneario offers relaxation baths and treatments in a beautifully preserved 19th-century establishment surrounded by woodlands of oak and beech. The gorge itself, with its nesting colonies of vultures and eagles soaring above the limestone cliffs, provides a wildlife spectacle that complements the soothing atmosphere of the site. The profound tranquility of this remote valley makes Sobrón one of Spain's most restful thermal destinations.
Insider tip — Balneario de Sobrón sits beside the turquoise reservoir of Sobrón on the Ebro river in Álava, where bicarbonate-calcium water at 26°C emerges from Cretaceous limestone formations. The historic balneario, rebuilt after flooding from the reservoir, specializes in digestive and metabolic treatments under Spanish Social Security accreditation. The lakeside setting is exceptionally scenic with oak-covered cliffs reflected in the reservoir waters. The Rioja wine country lies just 40 km to the south, making this a natural pairing for a gastronomy-and-wellness break.