Vlčí rokle Natural Monument, Natural monument in Prosečnice, Czech Republic.

Vlčí rokle Natural Monument is a ravine in the Požárské lesy forest near Prosečnice, protected since 1990 and enlarged to 8.513 hectares in 2007. Its floor is filled with a stone sea of biotite granodiorite boulders up to several metres across, beneath which the Vlčín brook disappears in places. The slopes carry old acidophilous beech forest with trees over 200 years old.

Protection was first declared by the Benešov district authority as a protected natural feature, effective 1 November 1990, on about five hectares. A Central Bohemian regional regulation (No. 3/2007), effective 22 September 2007, re-declared the site and enlarged it to 8.513 hectares with closer protection conditions; the subject of protection stayed the same. The land once belonged to the Dolní Břežany estate, managed by the Archbishop of Prague until 1911.

The name Vlčí rokle (Wolf Gorge) is linked to poaching battles once fought here, described by writer Jan Morávek in his work Divočina. The brook Vlčín supplied drinking water to the lung sanatorium in Prosečnice, and an abandoned waterworks building for the sanatorium still stands, with a large spruce growing on its flat roof.

The gorge lies at about 350–430 m above sea level in the Požárské lesy, roughly 2 km north of Prosečnice. It is open on foot all year, first along the red-marked route and then the yellow one, and entry is allowed only on marked paths. The nearest train station, Prosečnice, is 2.1 km away.

The boulders are biotitic granite, not limestone: about 330 million years old, they cracked as the cooling magma shrank and were rounded by weathering and water. The gorge was once wrongly explained as the work of a glacier.