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In Austria we are surrounded by a lot of mountains and lakes, so this is what I think representing our country best, or at least the area where I‘m living.
Taken this photo on July 17th, 2011 in the south of Austria, Carinthia.
The Lake Millstatt has a length of 13km and the deepest point is at 140m called Virgin Jump. The Lake Millstatt is also the deepest lake in Carinthia.
You can find that photo here too:
Here is the list of some geocaching which are located aroung that area