Rezerwat Krwawe Doły

Krwawe Doły Nature Reserve - a forest nature reserve in Bory Tucholskie, on the border of the Bory Tucholskie mesoregion with the Kashubian Lake District, in the Wdzydze Landscape Park, south of Lake Chądzie. Administratively, it is located in the municipality of Stara Kiszewa, in Koscierzyna county, Pomeranian province. It is located on the plan of a triangle, occupying forest subdivisions No. 572b and c of the Kościerzyna Forest District.

The reserve was established in 1996 on the area of 13.02 ha. The aim of protection is preservation of the fragment of typical for Tuchola Forest ecosystem of suboceanic fresh pine forest Leucobryo-Pinetum.

The reserve area is located on a slightly undulating sandstone at an altitude of 146.5-150.3 m above sea level.

The reserve protects mainly old-growth fresh coniferous forests, as well as transitional forms between fresh and dry coniferous forests, representing a mosaic of these forest types typical for the eastern part of the Tuchola Forests. Most of the forest stand originates from plantations, being the first and the second generation of the forest on former farmland. There are also localities of numerous protected plant and lichen species. In total, about 21 species of vascular plants, 12 species of bryophytes and as many as 48 species of lichens were found on the reserve.

The nearest settlements are Olpuch-Dworzec and Cięgardło. The reserve is located on the Stone Circles Trail. Near the reserve, but outside its boundaries are meadows and peat bogs of the Krwawe Doły Gorge.

The reserve lies within the Wdzydze Landscape Park and the Natura 2000 bird area "Bory Tucholskie". It forms part of the core zone of the Tuchola Forest Biosphere Reserve.

Under the current conservation plan established in 2015, the reserve area is under active protection.