Grosssoelk, Styria, municipality in the district of Liezen, alt. 694 m, pop. 574, area 20.82 km2, main settlement in the Soelktal valley. - Soelk power plant with reservoir (built 1978, 206,000 MWh), nature preserve (since 1983, area 277 km2, includes the municipalities of St. Nikolai, Kleinsoelk and parts of Grosssoelk); wood processing, flour mill. - Parish church (1730-1740, formerly horse-stable), situated on top of a rock; fortified walls, former Grosssoelk Castle (15th - 16th centuries).