remains of the opokskogo hydroelectric complex in the rays of the setting sun. village threshold in velikoustyugsky district, volo

abrupt airlock arrow beauty blue canal canyon chamber complex dam district evening gates geological grass hydroelectric landscape layers lock monument natural nature navigable north obokstroy opoki opokskogo opoksky outcrop piles porog power rays region remains reserve river rock ruins russia russian setting shore single sky sluice station sukhona summer sunny threshold tract ustyugsky velikoustyugsky veliky village volo vologda water waterworks