Grote Sluis Vianen - a canal lock. Objective: raising and lowering boats between the river "Lek" and the canal "Merwedekanaal". The structure includes two local traffic bridges. Location: the city of Vianen. Waterway: the canal "Merwedekanaal" is about 50 meters wide and boats have 6.7 meters clearance at the northern bridge, and 3.6 meters at the southern. More information available in the video.