Bodensee Facts

The Bodensee shares borders with Germany, Austria and Switzerland.  With a total of 273 Kilometers of shoreline, most of it is German, with 173 Kilometers.  72 Kilometers are Swiss and the remaining 28 Kilometers borders Austria.  International lawyers consider the Bodensee to be the only lake to never have clearly defined borders.  The bodensee is the third largest lake in central Europe and reaches depths of 250 meters, but a large majority of the lake is not that deep.  The lake has 11 islands, one of which, Reichenau, is a UNESCO World Cultural Heritage Site. The lake almost never freezes thoroughly.  The lake has only frozen thoroughly 32 times since 875 A.D.  The last reported freezing was in 1963.

http://www.tourmycountry.com/austria/bodensee.htm

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http://www.travelpod.com/travel-blog-entries/kiemce/worldtrip2006/1149786000/tpod.html