akiba dam
akiha lake
attractions
bridge
concrete dams
dam
dam lake
dragon mountain
flood control
gravity dams
hamamatsushi
hokkaido
hydroelectric power generation
japan
journey
longing
mother nature
mountain
mountain range
mountainous part
national monument park
natural
ogling
ohashi
popular spots
power
power generation
ri
river
ryuzan bridge
scenery
shizuoka prefecture
sunny
surface of a mountain
tenry river
tenryu backokumikawa quasinational park
tenryu oku mikawa
tenryuku
tokai region
tokura
tourism
tourist attractions
travel
unexplored
upstream
views
water
water cannon
water level