Reflection of the Sun on the Danube River in Donau-Auen, Vienna, Austria Aerial

reflection sun danube river donauauen vienna austria floodplains nature water national park natural forest green lake scenic europe conservation donau grass danube river lower austria wetland outdoors pond trees wilderness ecosystem conservation area lobau donauauen national park nature reserve wetlands dechantlacke foliage habitat woodland moorland greens meadow riverside forestry donau river danube island marsh wildlife flora fauna protected