Aerial view of Lake Constance and the Alps (the town of Radolfzell and Mettnau peninsula can be clearly identified at the bottom of the image, Constance in the centre) on 27th February, 2017. Picture taken from Lufthansa Airbus A321-231 D-AISI, en route from Lisbon to Frankfurt, at FL 340 while overflying Singen (Hohentwiel)
<a href="//commons.wikimedia.org/wiki/User:Jimmykreislauf" title="User:Jimmykreislauf">Peter Nath</a>
CC BY-SA 4.0
<span class="int-own-work" lang="en">Own work</span>