"Prządki" is a geological reserve with the area of 14 hectares situated in the village of Czarnorzeki (Korczyna commune). The reserve contains coarse sandstone outliers with the height of 20 metres. These rocks have taken original shapes under the influence of erosion and now have adequate names, e.g. Prządka-Mother, Prządka-Woman, Ringleader, Small Stairs, Nuts, Lover, Gorilla. Single rocks called monadnocks are under protection here.