Bernatka is a short river that flows in the vicinity of Skarżysko-Kamienna. It is a left-bank tributary of the larger Kamienna River. A reservoir was created on the river in the western part of Skarżysko-Kamienna.
Bernatka's springs are located in the forests north of Bliżyn, near the town of Ubyszów. In a small, swampy area, you can easily find several water outflows that quickly form into a mountain river.