I would like you to submit your photos of waterway navigation locks. These are used to enable vessels to change altitude on rivers and canals without negotiating fast-flowing water. Boat and ship sizes are defined by the smallest lock on a waterway but they do not need to be present in your image. You may may focus on a small detail of the lock or take a wider view of a lock system in its environment. I hope you can find something to interest me.
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