Jana from Ruse, Bulgaria sent me a card of the river near her home town. She writes that the Rusenski Lom ( or only Rom ) is not so clean as it seems to be in the card. She thinks it's perhaps an old photo or then it is just edited.
Nature Park of Rusenski Lom is one of the ten nature parks of Bulgaria. It is situated along the canyon type valley of Rusenski Lom River - the last right feeder of the Danube. The park is recognized as an interesting and precious site of high aesthetic value preserving beautiful riverside terraces, meanders, high vertical rocks, areas of rich variety of species, caves, rock formations, historical monuments of national and international significance.