The Königssee is a natural lake in the extreme southeast Berchtesgadener Land district of the German state of Bavaria, near the Austrian border. Most of the lake is within the Berchtesgaden National Park.The lake is noted for its clear water and is advertised as the cleanest lake in Germany. For this reason, only electric-powered passenger ships, rowing, and pedal boats have been permitted on the lake since 1909. Passenger services along the length of the lake are operated by the Bayerische Seenschifffahrt company and call at Seelände (Schönau), St. Bartholomä, Salet (mid-April to mid-October), and Kessel (on request). In ideal conditions, the longest tour takes two hours from Seelände to Salet. Swimming is permitted except in the lock area at Seelände.