High Quality Content by WIKIPEDIA articles! Vol ji Potok is a village on a terrace on the left bank of the river Kamni ka Bistrica in the Kamnik municipality in the Upper Carniola region of Slovenia.The local church is dedicated to Saint Oswald.Vol ji Potok is best known for its arboretum, the largest and most popular horticultural amenity in Slovenia. The Vol ji Potok Arboretum is open from the beginning of March till the end of November. It was established in 1952 by the University of Ljubljana on what was already a well established estate with extensive parks around a Baroque mansion that was destroyed in the Second World War