Linked from
The 30 pages that link to Canal lock, each with the reason it gives.
Canal du MidiNarrower topic: Locks are the basic devices behind the canal’s changes in elevation.
Elbe–Lübeck CanalNarrower topic: The canal’s locks are instances of this basic waterway technology.
Albert CanalNarrower topic: Locks enable navigation where the canal crosses changes in elevation.
Danube–Black Sea CanalNarrower topic: Locks let ships move through the canal's changes in elevation.