It was declared in 1960 in the area of Mount Jizera (1,122 m), the second highest mountain on the Czech side. The subjects of the protection are in particular the relics of the original mountain spruce stand growing on the rock and wetland, and the dwarf pine present on the highest parts of the mountain. During the recent decades, the original forest was heavily damaged by emissions. The southern slope is distinctive with a large detritus field. The relatively high and very ragged peak offers fabulous views of the surroundings.