Our visit to Eagle’s Nest was part of our German Road trip (that page has links to all the hotels, restaurants and places visited).
Situated within the Berchtesgaden Alps, the Königssee lake is 7.7 km (4.8 mi) long and 1.7 km (1 mi) across at its widest point. The lake is similar to a fjord, being surrounded by the steeply-rising flanks of mountains. 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.
We visited the local town of Schönau am Königssee at the Northern end of the lake. We needed to leave and drive to Nuremberg, so we didn’t have time to take the boat trip. There was also a cable car that we had to skip. Maybe next time.
The whole place is picturesque, although there were still plenty of wasps around (August 2018) doing their best to ruin things. I’d certainly recommend a visit, even if, like us, you only have time to stroll around.
Lake Königssee, Berchtesgaden, Germany
https://www.berchtesgaden.de/en/nature/lake-koenigssee