Taking the electric boat of the Bayerischen Seenschifffahrt from the landing place in Schönau provides a breath-taking, postcard view as one glides silently for three-kilometres to the dock in St. Bartholomew at the other end of the Königssee. The lake only has an area of five square kilometres, but is more than seven kilometres long. On its shores, rugged cliffs, hundreds of metres high, reach up into the white-blue Bavarian sky. Although the water is very clear – the Königssee is considered the cleanest body of water in Germany – one can only see the bottom in a few places. This is because the cliffs go down into the deep water just as steeply as they reach out of the water: a stone would sink 190 metres to the ground, if it is dropped into the water in the deepest spot.