ruins of the opokskogo hydroelectric complex near the village of porog, velikoustyugsky district, vologda region

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