Beginner Quiz Which is the largest lake in Germany? How much water surface does Germany have? 5.233 km² 8.364 km² 10.004 km² What endangers swimming in the lake in the summer? Blue algae Yellow algae Red algae What types of water bodies really exist? (several answers possible) Running waters Sprint waters Still waters Sound waters What is social media data? (multiple answers possible) Twitter Strava Netflix Instagram How many EU bathing sites are there in Germany? 1542 2301 3009 Time is Up!