Údolí Doubravy, Nature reserve in Bílek, Czech Republic

Údolí Doubravy is a nature reserve near Bílek featuring a river valley carved through impressive rock formations and steep canyon walls. The landscape includes dense forest coverage, a flowing river with natural pools, and distinctive rock shapes created by water erosion over time.

The Doubrava Valley has been a nature reserve since 1986, protecting the rocky upper course of the Doubrava in the Železné hory protected landscape area. On the summit of Sokolohrady, the valley's highest rock at over 40 m, earthen ramparts of a 13th-century castle survive and can be reached by footpath.

The rock formations carry local names that walkers use as landmarks: Vláček, Mikšova jáma, Hrádek, Doupě, Koryto, Sokolohrady and Čertův stolek. A marked path climbs to a viewing point on Sokolohrady, where the earthworks of a 13th-century castle remain visible above the river bend.

The reserve can be accessed via marked hiking trails with multiple entry points in the surrounding area. Visitors should wear sturdy footwear due to rocky terrain and uneven surfaces along the pathways.

At the lower end of the Koryto gorge, the river has eroded a pothole 120 cm across and 35–105 cm deep, now about 1 m above the water level, showing that the Doubrava is still cutting into its bed. On the left bank, Čertův stolek is the area's only rock tower, rising about 30 m above the spruce canopy.