Seerhein, River section between Upper and Lower Lake Constance in Baden-Württemberg and Thurgau, Germany and Switzerland
The Seerhein is a river section connecting Upper and Lower Lake Constance, extending roughly 4 kilometers across the border region. The water maintains a slight elevation difference between the two lakes, which drives the current flow.
During the Roman period, the river marked the northern frontier, and later it became a boundary between different territories. This role as a dividing line shaped the region's development for centuries.
Three bridges in the upper section connect communities on both sides of the border. They allow daily interaction between people living in Germany and Switzerland.
Regular boat services operated by the Swiss Shipping Company connect various points along the river. The best time to visit is from May to September, when the weather is mild and boat schedules are most frequent.
In February 1549, unusual weather conditions created standing waves that made the river appear to flow backwards. This rare phenomenon was recorded at the time as the water miracle of Constance.
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