Taubensee is a small lake right at the border between Germany (Chiemgau Alps) and Austria (Kitzbühel Alps). It is one of the highest lakes in Germany with 1.138 meters above sea level.
You can hike there from both countries. We started our 2 hour hike on a cloudy rainy day in Kössen which is on the Austrian side and here are some pictures from the hike...