Flachau, province of Salzburg, municipality in the district of St. Johann, alt. 927 m, pop. 2,210 (1981: pop. 1,892), area 117.26 km2, a winter sport resort (799,906 overnight stays) situated in the valley bearing the same name where the River Enns originates in Pongau. - Flachauwinkel cableway to the Glonerboden peak, Flachau cableway; timber processing (sawmill, furniture). - From the late Middle Ages until 1866 iron mining and smelting; Baroque parish church (1719-1721) influenced by J. L. v. Hildebrandt, Hoech Castle (first documented mention in 1209, renovated around 1615, modernised from 1880 to 1893), castle chapel decorated with coats of arms (16th century); old farmsteads; Thurnschloessl in Feuersang (16th century).
Literature#E. Kollek, Die Gemeinde Flachau und ihre wirtschaftliche Entwicklung, master's thesis, Vienna 1977.