Boubínský prales, National nature reserve in Horní Vltavice, Czech Republic.

Boubínský prales is a nature reserve featuring dense forest on the southern slopes of Boubin Mountain, extending to roughly 1,360 meters in elevation. The core forest area remains off-limits to visitors, but marked trails starting near Boubínské jezírko reservoir allow exploration of the protected perimeter.

Forester Josef John, head of the Vimperk forests of the Schwarzenberg estate, had research plots marked out from 1847 and pushed through protection in 1858, making this the third oldest Czech nature reserve. A storm in 1870 led to logging inside it, leaving only about 47 ha untouched; the core was fenced in 1963 and closed to the public in 1979.

The 4 km Naučná stezka has eight stops starting at Boubínské jezírko, a reservoir built in 1836 to float timber; one stop shows the remains of Král smrků, a spruce 440 years old, 57 m tall and 160 cm across, felled by a 1970 windstorm. A blue mark from Kubova Huť leads to Johnův kámen, named for Josef John, the forester who initiated the reserve.

The inner forest is not open to visitors, but the surrounding paths are available for walking and provide good views of the landscape. Wear proper hiking gear, as the trails pass through hilly terrain.

Some trees in this forest reach several hundred years of age, serving scientists as a window into how forests develop naturally. Such ancient specimens are rare across Europe and make this region particularly valuable for research.