Brunnenmühlenquelle, Karst spring in Heidenheim an der Brenz, Germany.
The Brunnenmühlenquelle is a karst spring near Heidenheim where water emerges from underground and flows directly into the Brenz River. The spring basin sits along the river's right bank and remains open to view, with water volume changing noticeably across seasons.
The spring was valued enough in the 1500s to fuel an ambitious water system that supplied a nearby castle. This early use reveals how important karst sources were to regional infrastructure and settlement.
The spring has long been central to local water supply and shapes how people in the region relate to their landscape. Visitors can observe how natural water sources influenced where communities settled and grew.
The location is easy to reach, situated directly between Heidenheim and Mergelstetten along the Brenz, accessible from the riverbank path. Visitors should know that water volume changes significantly with rainfall and snowmelt, and access can become difficult during high water periods.
Water for this spring comes from an underground catchment area that spreads across a very large region. This hidden network shows how complex the karst landscape is beneath the surface.
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