aerial
aerial view
alps
blue
cloud
cloudscape
dam
electricity
energy
environment
environmental conservation
extreme terrain
fuel and power generation
furka pass
generator
grass
green
grimsel pass
hydroelectric power station
industry
lake
lake grimsel
landscape
moss
mountain
mountain peak
mountain range
nature
outdoors
panoramic
passport
reservoir
scenics
skirt
sky
switzerland
tranquil scene
valley
water
wildlife reserve