Spa of the Arnoia Activity · Arnoia, Ribeiro, Ourense Image of Arnoia, not of the place itself. A thermal complex beside the River Arnoia fed by hypothermal waters that emerge at 22 degrees, weakly mineralised, sulphurous and bicarbonated, with a pH close to neutral; its facilities were refurbished in 2015. Photo: Luis Miguel Bugallo Sánchez (User:Lmbuga) (CC BY 3.0) What to see and do in Arnoia