Smraďoch, Nature reserve near Mariánské Lázně, Czech Republic.
Smraďoch is a nature reserve on the edge of Mariánské Lázně in the Czech Republic, where gas vents at the surface release hydrogen sulfide from underground fissures. These vents form small geyser-like structures called mofettes, which are scattered across the protected ground.
The area was granted official protection in November 1968, after its geological value was recognized in connection with regional tectonic activity. That recognition made it possible to protect the underground structures and the habitats that depend on them.
Botanists visit the site to study rare plants such as the Marsh Helleborine and the Round-leaved Sundew, which grow in the mineral-rich soil around the gas vents. Walking the wooden trail, visitors notice how the plant cover shifts noticeably from one section to the next.
A wooden boardwalk runs through the reserve and is easy to walk for most visitors. Information panels along the route explain the geological and botanical features of the ground.
Bleached animal bones lie near the gas vents, as small mammals and birds occasionally succumb to the hydrogen sulfide emissions. These remains are visible from the boardwalk and offer a quiet reminder of what happens just below the surface.
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