'Zeleni Vir', can be translated as 'Green Eddy' or 'Green Whirlpool', is a name of a resort near the village Skrad in Croatia, that was in 1962 declared as an Nature Reservation. It was first mentioned in 1884 as a resort for the skilled hikers. After the construction of the hydroelectric power plant in 1921-1922, which is supplied with the water from the spring inside the cave, the paths and the metal bridges through the canyon named 'Devil's passage' were built.