Rašeliniště Jizerky, Protected peat bog reserve in Kořenov, Czech Republic.

Rašeliniště Jizerky is a national nature reserve of raised bogs, transition mires and species-rich mat-grass meadows in a flat basin at 850–880 m, northwest of the Jizerka hamlet. The peat, up to six metres deep, lies over impermeable porphyritic granodiorite around the meandering Jizerka stream and its tributaries, with dwarf pine, rowan and Carpathian birch in the shrub layer.

The area was officially designated as a nature reserve in 1960 to protect its rare bog ecosystems and specialized species. This early recognition by authorities showed they understood how important such places were for conservation.

The place serves as a refuge for rare bog plants and specialized insects that thrive only in wet, acidic soils. Visitors can observe how these habitats support life throughout the seasons and adapt to changing conditions.

The reserve lies in a flat basin at 850–880 m around the meandering Jizerka stream, northwest of the Jizerka hamlet. The peat is waterlogged year-round and up to six metres deep, so waterproof boots are needed and visitors should stay on the marked paths.

The peat layer here reaches up to six metres deep, built over millennia by a population of peat moss. The streams crossing the reserve have yielded sapphires, rubies, zircons and precious metals, and gem mining once damaged the bog.