the lock system of telemark canal

architecture arm blue boat boating bridge bridges canal canals channel colorful colour construction country countryside cruise dam details engineering europe fence flow freshwater gate gates green historic holiday inland landscape landscapes leisurely level lock locks long metal movement narrow nature norway old orange outdoor passage passageway picturesque port pretty river rural scene scenery scenic sea ships sky sluice structure sunshine technology telemark tourism traditional transport travel tree trees typical vegetation vessel water waterscape waterway waterways weirs wood