Edited by Luka Andic, some rights reserved (CC BY-SA)
Photo Credits
- 1. (c) Katja Schulz, some rights reserved (CC BY)
- 2. (c) Center for Lakes and Reservoirs, some rights reserved (CC BY-NC)
- 3. (c) Stefan, some rights reserved (CC BY-NC), uploaded by Stefan
- 4. (c) Adam Cohen, some rights reserved (CC BY), uploaded by Adam Cohen
