Jizerskohorské bučiny, Nature reserve in Frýdlant, Czech Republic.

Jizerskohorské bučiny is a national nature reserve of 27 km² in the northern Jizera Mountains, formed in 1999 by merging seven older reserves. Its core area covers 950.9 ha, with a buffer zone of 1,750.4 ha, and it spans elevations from 360 m near the Dubina forester's lodge to 1,006 m at Polední kameny. Deep-cut valleys and rocky outcrops mark the terrain, which includes the roughly 30 m Velký Štolpich waterfall, the largest in the Jizera Mountains, and the 7 ha Šolcův rybník pond.

The area received protection status in 1960 and was preserved without human intervention before becoming a national nature reserve in 1999. This long history of protection allowed the forest to maintain its natural structure and species composition.

This place represents a space where ancient beech forests shape the landscape and visitors can experience nature in its original state. People come here to understand how natural forest ecosystems function and recognize the role these trees play across Europe.

The best way to explore this forest is on foot using existing trails that wind through different elevations. The paths can vary in difficulty depending on weather and season, so sturdy footwear is recommended.

In July 2021 these beech forests became the first Czech natural site inscribed on the UNESCO World Heritage list, added to the existing Primeval Beech Forests of the Carpathians and Other Regions of Europe, which by the end of 2019 counted 78 sites in twelve countries. The nomination was submitted in 2019 by the Nature Conservation Agency of the Czech Republic through the Ministry of the Environment.