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lock

A gated channel enabling ships to transition between two levels or sections of water.

A lock is a sluice constructed for boats, providing a gated channel of water allowing them to navigate the transition between two sections of water. In most cases these are used where the water level differs between the two sides, and while one or more boats is in the lock the gates will close and the water level inside is raised or lowered to match the water on the forward side.

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