Smraďoch, Nature reserve near Mariánské Lázně, Czech Republic.
Smraďoch is a nature reserve near Mariánské Lázně, distinguished by a network of gas vents releasing hydrogen sulfide from underground fissures. These vents produce small geyser-like formations called mofettes that appear throughout the protected area.
The area received official protection status in November 1968 following recognition of its geological importance due to regional tectonic activity. This designation enabled safeguarding of the unique underground structures and ecosystems they support.
The site attracts botanists studying rare plant species such as the Marsh Helleborine and Round-leaved Sundew, which thrive in the mineral-rich setting created by underground emissions. Visitors walking along the wooden trail notice how the vegetation changes in zones shaped by the gas activity below.
Visitors can explore the area via a wooden boardwalk designed for easy accessibility, with informative signs explaining geological and botanical features. The trail is well-organized, helping guests discover the key natural features without requiring extensive physical effort.
The area contains bleached animal bones and skeletal remains near the gas vents, as small mammals and birds occasionally succumb to the hydrogen sulfide emissions. This silent reminder of the power of underground processes is visible while exploring the grounds.
The community of curious travelers
AroundUs brings together thousands of curated places, local tips, and hidden gems, enriched daily by 60,000 contributors worldwide.
