Blautopf
Lake Deep karst spring famed for its vivid blue color
The Blautopf spring in Blaubeuren feeds the Blau River; its cobalt-blue water sits above a deep karst sinkhole and cave system, drawing day-trippers, divers and photographers.
The Blautopf is a karst spring in the town of Blaubeuren, Baden-Württemberg, notable for its intense blue water and its role as the source of the Blau River. The spring emerges from a steep-walled sinkhole set in the town centre and feeds the river that runs through the valley.
The pool sits above an extensive submerged cave system and has attracted scientific diving and speleological exploration. The striking color has long made it a local landmark and subject of folklore.
Local legends and historical references date back centuries, and the spring has been a feature around which the town developed. Modern interest also includes geological and hydrological study of the karst system.
The Blautopf is in the Swabian Jura, roughly west of Ulm, and is directly adjacent to the medieval centre of Blaubeuren.
- Viewing tip: The blue color comes from light scattering in the spring's clear karst water and is most vivid in bright daylight; viewing from the terrace by the town centre gives the best uninterrupted sightline.
How to Get to Blautopf #
Blautopf is in the center of Blaubeuren, accessible by regional trains from Ulm and by local bus. The spring is a short walk from Blaubeuren train station.
Tips for Visiting Blautopf #
- Arrive in the morning to see Blautopf in deeper blue-light angle affects the color dramatically.
- Local guided cave tours explore the gypsum cave system beneath the spring; book these in advance through Blaubeuren tourist office.
- Do not attempt to dive the spring without joining an experienced team-Blautopf's submerged passages are technical and dangerous.
Best Time to Visit Blautopf #
Spring through late summer for best light and active tourist services; cave tours may run year-round with seasonal schedules.
Weather & Climate near Blautopf #
Blautopf's climate is classified as Warm-Summer Continental - Warm-Summer Continental climate with mild summers (peaking in July) and freezing winters (coldest in January). Temperatures range from -4°C to 21°C. Moderate rainfall (915 mm/year).
January
January is the coldest month with highs of 1°C and lows of -4°C. Moderate rainfall (57 mm).
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February
February is freezing with highs of 2°C and lows of -4°C. Moderate rainfall (56 mm).
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March
March is cold with highs of 7°C and lows of -1°C. Moderate rainfall (58 mm).
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April
April is cold with highs of 11°C and lows of 2°C. Moderate rainfall (70 mm).
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May
May is cool with highs of 16°C and lows of 7°C. Regular rainfall (92 mm).
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June
June is cool with highs of 19°C and lows of 10°C. The wettest month with heavy rain (112 mm).
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July
July is cool with highs of 21°C and lows of 12°C. Significant rainfall (102 mm).
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August
August is cool with highs of 21°C and lows of 11°C. Regular rainfall (90 mm).
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September
September is cool with highs of 17°C and lows of 8°C. Moderate rainfall (73 mm).
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October
October is cold with highs of 11°C and lows of 4°C. Moderate rainfall (68 mm).
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November
November is cold with highs of 5°C and lows of 0°C. Moderate rainfall (70 mm).
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December
December is freezing with highs of 2°C and lows of -3°C. Moderate rainfall (67 mm).
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