The Bolko Oak – a pedunculate oak, which, according to measurements from 1992, sprouted around 1370, making it approximately 650 years old. It grows in a former manor park in Hniszów, Ruda-Huta commune, and has been protected as a natural monument since 1959.
In the first decade of the 21st century, its circumference was 870 cm, making it one of the largest oaks in Poland. It reaches a height of 29 m. To stabilize the tree, conservation procedures are performed on it, including sanitation pruning, and the crown is stabilized by dynamic bonds.
The Bolko Oak has an exceptionally impressive crown, measuring 34 x 30 m.