Sirný pramen, Natural spring near Mařenice, Czech Republic
Sirný pramen is a natural spring near Mařenice featuring a circular pool approximately three meters wide. The water contains high iron content that deposits yellowish-brown sediment throughout the basin.
The spring was long mistaken for a sulfur deposit until Professor Hans Molisch identified the true nature of the brown deposits in 1907. This misunderstanding influenced how the site became known and understood for many years.
The spring area features wooden bridges and hiking trails marked with green and yellow signs, connecting to the path toward Horní Světlá.
The spring sits at roughly 525 meters elevation and is accessible via marked hiking trails from nearby parking areas. Colored trail markers help visitors navigate the way to the site.
The water is shaped by Leptothrix ochracea bacteria, which transform dissolved iron into rust-colored deposits. These microscopic organisms create the distinctive patterns and colors visible in the pool.
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