agger valley dam
aggertalsperre
arch dam
architecture
artificial lake
barrier
blue
buzzer
catchment lake
dam
electricity
flood control
flood protection
forrest
germany
hiking
hydroelectric power plant
journey
landmark
landscape
masonry
nature
north rhinewestphalia
power generation
powerplant
rampart
renewable energy
reservoir
sky
stability
stable
storage reservoir
tourism
water
water supply