Regulanka, also called Potok Regulicki, has a length of 13 kilometers. Its source is located in Regulice village; the stream flows through Alwernia, Kwaczała, Okleśna and feeds the Vistula (of course).
Regulanka is fed by Brodła – very clear and pure brook with lagoon made on it. Regulanka’s waters are mainly clean and drinkable; however, after Alwernia, where it meets chemical plants, it becomes a dead river. Its waters are pink, white, or yellow – it depends on the contamination from the chemical plants.