Extremely charming and green tributary of Wieprza. When you spend the weekend on Pokrzywna and Wieprza you can expect a meeting not only with nature, but also with a rich history of these areas as probably it is here where you will find the most valuable examples of hydraulic engineering from the twentieth century in Poland and Europe. Despite the fact that even inexperienced individuals can handle both sections, at the beginning of the first section there are few surprises in the form of faster flowing water and a few trees in the riverbed, which, however, can be either canoed or easily overcome from the top or bottom.