Traunsee

Traunsee is a lake in the Salzkammergut, Upper Austria, Austria. Its surface is approximately 24.5 km2 and its maximum depth of 191 metres makes it the deepest and by volume largest lake located entirely within Austrian territory; only Lake Constance on the border is deeper and bigger. It is a popular tourist destination, and its attractions include Schloss Ort, a medieval castle. (Wikipedia)