The nature trail is marked with shape marks with a green stripe. It starts in a parking lot on the southern edge of the village Jizerka. From the basalt quarry (stop no. 3), one of its branches climbs steeper to the lookout peak of Bukovec, the other branch bypasses the peak without much elevation. The proposed walk continues through the center of Jizerka and continues until the last, thirteenth stop in the NS. From here we return to the starting point. An extension of the nature trail across the state border (bridge on the Jizera) and a continuation to the Polish settlements of Orle and Velká Jizera are also prepared. Hence the name of the trail: Three iserins - semi-precious stones symbolize the three mentioned settlements. It was taken over from the title of the publication of the same name. Further information can be found at: www.vilaizerina.cz.