architecture
background
big
bridge
building
clean
concrete
construction
dam
electricity
energy
engineering
environment
gravity
high
hoabinh
hydroelectric
hydropower
indochina
industry
lake
landscape
long
mountain
nature
outdoor
peaks
plant
power
puente
reinforced
retaining
river
rock
rockies
scene
sky
station
storage
structure
summer
supply
tree
valley
vietnam
vietnamese
village
wall
water
wilderness