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(A) Upper Río Agrio (URA) near its geothermal sources; (B) Sulphur deposits in the margins of URA; (C) URA in the area of the waterfalls; (D) Waterfall ‘Salto del Agrio’ in Lower Río Agrio where the precipitates of ferric iron can be noticed; (E) Copahue Thermal Centre; (F) Las Maquinitas; (G) Anaerobic sediments; (H) Microbial biofilms.
