The Kolpa River flows through its southern part. Some call it »Switzerland of Bela Krajina« , as this plateau valley above the Kolpa is surrounded by the peaks of `Poljanska gora´ and Graščica, and the canyon valley itself has beautiful viewpoints: Radenska stena, Sodevska
stena, Kozice, Saint Anton and on the Croatian side the Orlova stena. There are also marked hiking trails leading to them. The Kolpa River is also called the “Slovenian´s longest coast”, as visitors can find natural bathing spots all along the course of this border river, and in the Poljanska Valley it is also suitable for “frostier”, as in summer in Radenci, it warms up to 28 degrees Celsius. The Kolpa River is one of Europe´s warmest and cleanest rivers. The purity of the river is reflected in the many rare and endangered species of flora and fauna that have been preserved there. Rare and endangered species include: the otter, the bog turtle, the fish: streber,the European bullhead, Sabanejewia aurata, barbel, the European bitterling, stargazer, cactus roach, huchen; the Lethenteron zanandreai and the Unio crassus. The valley itself not only offers swimming, boating – rafting, but also cycling, climbing and hiking.