Traunsee is a lake in the Salzkammergut, Austria. Its surface is approximately 24.5 km² and its maximum depth is 191 metres. It is a popular tourist destination, and its attractions include Schloss Ort, a medieval castle. At the North end of the lake is Gmunden, at the south end is Ebensee. The lake is surrounded by mountains, including the Traunstein, and a number of other towns and villages surround the lake, including Altmünster and Traunkirchen.