In the Swabian Mountains in southern Germany is a spring so blue that it attracts countless visitors. Known as the Blautopf (“blue pot”), this strange mountainous spring forms the drain for the Blau (River Blue) cave system. What makes this spring particularly strange and unique is its deep blue color – a result of the physical properties of the nanoscale limestone present in the water.
According to scientists, that is.
Legends tell a different story.
One local myth claims that someone pours a vat of ink into the Blautopf every day to maintain its color. Another strange myth claims that it is impossible to measure the Blautopf’s depth since a water nix steals the leaden sounding line (a thin rope with a plummet) every time it is submerged. There is even a story about the Schöne Lau, a beautiful mermaid trapped in the Blautopf. Today, a life-size statue of the mermaid stands near the Blautopf.
Experienced cave divers are known to explore the Blautopf and its underground corridors (which are many miles long with enormous chambers). This, however, is restricted to well-trained divers, since it is dangerous and has led to fatalities in the past. But for most people, viewing the Blautopf from the outside is satisfying enough! The majestic blue color makes for spectacular photos year-round.