Perkuć Nature Reserve - located in the Płaska parish, covers an area of 209.82 ha. The protected species in the reserve is the spruce and pine forest with its original characteristics, typical for the Augustów Forest. Other less common forms of forest are the hazel-spruce mixed forest, which grows on slopes, and a riparian forest (spruce with an admixture of maple, linden and aspen). The shallow, overgrown Kruglak Lake is located within the reserve.
