# Geography and environmental characteristics of Lake Constace > Live situation record from CLSTR: https://clstr.news/situations/geography-and-environmental-characteristics-of-lake-constace > Updated: 2026-09-29T22:38:06.000Z. Sources: 6. Developments: 2. Lake Constance, or Bodensee, is a significant glacial lake situated at the borders of Germany, Switzerland, and Austria. It serves as a vital natural reserve and a major water supply, providing approximately 130 million cubic meters of drinking water annually to the German state of Baden-Württemberg. The lake is hydrologically driven by the Rhine river and covers a surface area of 536 km². While it is shallower than Lake Garda, reaching depths of 256 meters, it maintains a large water volume of 48.5 km³. The surrounding landscape is characterized by the Alps, hills, orchards, and vineyards. Environmental monitoring of the lake shows significant temperature variations based on depth and location. While deep-water temperatures remain near five degrees Celsius, summer temperatures frequently exceed 25 degrees Celsius. These conditions, alongside heatwaves, have influenced local swimming culture and trends, such as ice bathing, despite challenges regarding municipal funding for pool renovations and declining swimming proficiency among children. ## Timeline ### 2026-09-29: Lake Constance: Geography and importance of the Central European lake Lake Constance is a major Central European lake shared by Germany, Switzerland, and Austria, serving as a vital drinking water source and a significant tourist destination. 3 sources. https://clstr.news/cluster/lake-constance-geography-and-importance-of-the-central-european-lake ### 2026-09-28: Swimming culture and Lake Constance water temperatures Recent reports explore the cultural history and rising trends of swimming alongside real-time water temperature monitoring in Lake Constance. 3 sources. https://clstr.news/cluster/swimming-culture-and-lake-constance-water-temperatures --- Cite as: Geography and environmental characteristics of Lake Constace. CLSTR, https://clstr.news/situations/geography-and-environmental-characteristics-of-lake-constace